diff --git a/Icarus/CurrMachiningPanel/CurrMachining.vb b/Icarus/CurrMachiningPanel/CurrMachining.vb
index d740c98..d2cfeac 100644
--- a/Icarus/CurrMachiningPanel/CurrMachining.vb
+++ b/Icarus/CurrMachiningPanel/CurrMachining.vb
@@ -163,6 +163,21 @@ Public Class CurrMachining
       End Select
    End Sub
 
+   Friend Overrides Sub Save()
+      If bIsModified Then
+         ' salvo tutti i parametri su orig
+         SaveParams()
+         ' resetto stato di modificata
+         UpdateIsModified()
+      End If
+   End Sub
+
+   Protected Overrides Sub SaveParams()
+      For Each Cathegory In m_CathegoryList
+         Cathegory.SaveParams()
+      Next
+   End Sub
+
    Friend Sub WriteCurrParamInPart(nPartId As Integer)
       EgtSetInfo(nPartId, MAC_GUID, m_sCurrGUID.ToString())
       For Each Cathegory As CurrMachiningCathegory In m_CathegoryList
@@ -253,12 +268,6 @@ Public Class CurrMachiningCathegory
       End Select
    End Sub
 
-   Friend Sub SaveCurrParams()
-      For Each Param In m_MachiningParamList
-         Param.SaveParam()
-      Next
-   End Sub
-
    Friend Sub ResetCurrParams()
       For Each Param In m_MachiningParamList
          Param.ResetParam()
diff --git a/Icarus/CurrMachiningPanel/CurrMachiningPanelV.xaml b/Icarus/CurrMachiningPanel/CurrMachiningPanelV.xaml
index b2875c4..4628a52 100644
--- a/Icarus/CurrMachiningPanel/CurrMachiningPanelV.xaml
+++ b/Icarus/CurrMachiningPanel/CurrMachiningPanelV.xaml
@@ -120,39 +120,39 @@
                               <DataTemplate DataType="{x:Type PrintApp:OrderedMachiningParam}">
                                  <Grid>
                                     <Grid.ColumnDefinitions>
+                                       <ColumnDefinition Width="2*"/>
                                        <ColumnDefinition Width="1*"/>
                                        <ColumnDefinition Width="Auto"/>
                                     </Grid.ColumnDefinitions>
-                                    <Grid.RowDefinitions>
-                                       <RowDefinition Height="Auto"/>
-                                       <RowDefinition Height="Auto"/>
-                                    </Grid.RowDefinitions>
-                                    <TextBlock Text="{Binding sName}"/>
-                                    <StackPanel Grid.Column="1"
-                                                Orientation="Horizontal"
-                                                HorizontalAlignment="Right">
-                                       <Button Content="&lt;>"
-                                               Command="{Binding ResetOrder_Command}"
-                                               Style="{StaticResource ToolBar_SmallButton}"/>
+                                    <TextBlock Text="{Binding sName}"
+                                               VerticalAlignment="Center"/>
+                                    <ListBox Grid.Column="1"
+                                             ItemsSource="{Binding ValueList}"
+                                             SelectedItem="{Binding SelValue}"/>
+                                    <StackPanel Grid.Column="2"
+                                                Orientation="Vertical"
+                                                VerticalAlignment="Center"
+                                                Margin="5,0,0,0">
                                        <Button Content="˄"
                                                Command="{Binding MoveUpOrder_Command}"
+                                               Margin="0"
                                                Style="{StaticResource ToolBar_SmallButton}"/>
                                        <Button Content="˅"
                                                Command="{Binding MoveDownOrder_Command}"
+                                               Margin="0"
+                                               Style="{StaticResource ToolBar_SmallButton}"/>
+                                       <Button Content="&lt;>"
+                                               Command="{Binding ResetOrder_Command}"
+                                               Margin="0"
+                                               Style="{StaticResource ToolBar_SmallButton}"/>
+                                       <Button Content="R"
+                                               Command="{Binding ResetParam_Command}"
+                                               IsEnabled="{Binding bIsModifiedFromDb}"
+                                               VerticalContentAlignment="Center"
+                                               HorizontalContentAlignment="Center"
+                                               Margin="0"
                                                Style="{StaticResource ToolBar_SmallButton}"/>
-                                       <Button Grid.Column="2"
-                                            Content="R"
-                                            Command="{Binding ResetParam_Command}"
-                                            IsEnabled="{Binding bIsModifiedFromDb}"
-                                            VerticalContentAlignment="Center"
-                                            HorizontalContentAlignment="Center"
-                                            Margin="5,0,0,0"
-                                            Style="{StaticResource ToolBar_SmallButton}"/>
                                     </StackPanel>
-                                    <ListBox Grid.ColumnSpan="2"
-                                             Grid.Row="1"
-                                             ItemsSource="{Binding ValueList}"
-                                             SelectedItem="{Binding SelValue}"/>
                                  </Grid>
                               </DataTemplate>
                            </ItemsControl.Resources>
diff --git a/Icarus/CurrMachiningPanel/CurrMachiningPanelVM.vb b/Icarus/CurrMachiningPanel/CurrMachiningPanelVM.vb
index 4dd92b6..ed3ab3e 100644
--- a/Icarus/CurrMachiningPanel/CurrMachiningPanelVM.vb
+++ b/Icarus/CurrMachiningPanel/CurrMachiningPanelVM.vb
@@ -59,8 +59,23 @@ Public Class CurrMachiningPanelVM
    End Property
 
    Public Sub Ok()
+      ' verifico se modificata tipologia Ribs
+      Dim bIsModifiedRibsType As Boolean = False
+      Dim RibsCathegory As MachiningCathegory = CurrMachining.CathegoryList.FirstOrDefault(Function(x) x.Type = MachiningCathegory.Cathegories.RIBS)
+      If Not IsNothing(RibsCathegory) Then
+         Dim RibsTypeParam As MachiningParam = RibsCathegory.MachiningParamList.FirstOrDefault(Function(y) y.Type = MachiningParam.Params.RIBSTYPE)
+         If Not IsNothing(RibsTypeParam) Then
+            bIsModifiedRibsType = RibsTypeParam.bIsModified
+         End If
+      End If
       ' scrivo i parametri modificati
       m_CurrMachining.WriteCurrParamInPart(Map.refTopPanelVM.SelPart.nPartId)
+      m_CurrMachining.Save()
+      ' se modificata tipologia Ribs, aggiorno posizione riferimento
+      If bIsModifiedRibsType Then
+         Map.refReferencePanelVM.UpdateFramePosition()
+         Map.refDispositionPanelVM.UpdateZPos()
+      End If
       ' ripristino modalita' standard
       Map.refTopPanelVM.SelPage = Pages.MODIFY
    End Sub
diff --git a/Icarus/DispositionPanel/DispositionPanelV.xaml b/Icarus/DispositionPanel/DispositionPanelV.xaml
index 7ad69dc..ca57e3e 100644
--- a/Icarus/DispositionPanel/DispositionPanelV.xaml
+++ b/Icarus/DispositionPanel/DispositionPanelV.xaml
@@ -28,12 +28,6 @@
                  Content="Move"
                  IsChecked="{Binding bMove_IsChecked}"
                  Style="{StaticResource ToolBar_TextToggleButton}"/>
-   <!--<Border Background="Red"
-           Grid.Column="1"
-           Grid.Row="1"
-           Grid.RowSpan="5"
-           Width="50"
-           VerticalAlignment="Stretch"/>-->
 
    <Border x:Name="PopupBrd" 
            Grid.Column="1"
@@ -97,77 +91,12 @@
       </Grid>
    </Border>
 
-   <!--<Popup IsOpen="{Binding IsChecked, ElementName=MoveBtn}"
-          PlacementTarget="{Binding ElementName=MoveBtn}"
-          Style="{StaticResource LeftPanel_Popup}">
-      <Border x:Name="PopupBrd" Style="{StaticResource LeftPanelPopup_Border}">
-         <Grid>
-            <Grid.RowDefinitions>
-               <RowDefinition Height="Auto"/>
-               <RowDefinition Height="Auto"/>
-               <RowDefinition Height="Auto"/>
-               <RowDefinition Height="Auto"/>
-            </Grid.RowDefinitions>
-            <Grid Margin="0,0,0,2.5">
-               <Grid.ColumnDefinitions>
-                  <ColumnDefinition Width="Auto"/>
-                  <ColumnDefinition Width="1*"/>
-               </Grid.ColumnDefinitions>
-               <TextBlock Text="X"
-                          VerticalAlignment="Center"/>
-               <EgtWPFLib5:EgtTextBox Text="{Binding sXPos, UpdateSourceTrigger=Explicit}"
-                                      Grid.Column="1" 
-                                      Margin="5,0,0,0"
-                                      Style="{StaticResource LeftPanel_TextBox}"/>
-            </Grid>
-            <Grid Grid.Row="1"
-                  Margin="0,2.5,0,2.5">
-               <Grid.ColumnDefinitions>
-                  <ColumnDefinition Width="Auto"/>
-                  <ColumnDefinition Width="1*"/>
-               </Grid.ColumnDefinitions>
-               <TextBlock Text="Y"
-                          VerticalAlignment="Center"/>
-               <EgtWPFLib5:EgtTextBox Text="{Binding sYPos, UpdateSourceTrigger=Explicit}"
-                                      Grid.Column="1" 
-                                      Margin="5,0,0,0"
-                                      Style="{StaticResource LeftPanel_TextBox}"/>
-            </Grid>
-            <Grid Grid.Row="2"
-                  Margin="0,2.5,0,0">
-               <Grid.ColumnDefinitions>
-                  <ColumnDefinition Width="Auto"/>
-                  <ColumnDefinition Width="1*"/>
-               </Grid.ColumnDefinitions>
-               <TextBlock Text="Z"
-                          VerticalAlignment="Center"/>
-               <EgtWPFLib5:EgtTextBox Text="{Binding sZPos, UpdateSourceTrigger=Explicit}"
-                                      Grid.Column="1" 
-                                      Margin="5,0,0,0"
-                                      Style="{StaticResource LeftPanel_TextBox}"/>
-            </Grid>
-            <Grid Grid.Row="3"
-                  Margin="0,2.5,0,0">
-               <Button Content="Drag"
-                       Command="{Binding DragMove_Command}"
-                       Style="{StaticResource LeftPanel_TextButton}"/>
-            </Grid>
-         </Grid>
-      </Border>
-   </Popup>-->
  
    <ToggleButton x:Name="RotateBtn"
                  Grid.Row="4"
                  Content="Rotate"
                  IsChecked="{Binding bRotate_IsChecked}"
                  Style="{StaticResource ToolBar_TextToggleButton}"/>
-   <!--<Border Background="Blue"
-           Grid.Column="2"
-           Grid.Row="2"
-           Grid.RowSpan="5"
-           Width="50"
-           VerticalAlignment="Stretch"
-           HorizontalAlignment="Stretch"/>-->
 
    <Border Grid.Column="1"
            Grid.Row="2"
@@ -209,42 +138,4 @@
       </Grid>
    </Border>
 
-   <!--<Popup IsOpen="{Binding IsChecked, ElementName=RotateBtn}"
-          Grid.Column="1"
-          PlacementTarget="{Binding ElementName=RotateBtn}"
-          Style="{StaticResource LeftPanel_Popup}">
-      <Border Style="{StaticResource LeftPanelPopup_Border}">
-         <Grid>
-            <Grid.RowDefinitions>
-               <RowDefinition Height="Auto"/>
-               <RowDefinition Height="Auto"/>
-               <RowDefinition Height="Auto"/>
-               <RowDefinition Height="Auto"/>
-            </Grid.RowDefinitions>
-            <UniformGrid Columns="3">
-               <RadioButton Content="X"
-                            GroupName="Axes"
-                            IsChecked="{Binding RotAxes[0]}"
-                            Style="{StaticResource ToolBar_ToggleButton}"/>
-               <RadioButton Content="Y"
-                            GroupName="Axes"
-                            IsChecked="{Binding RotAxes[1]}"
-                            Style="{StaticResource ToolBar_ToggleButton}"/>
-               <RadioButton Content="Z"
-                            GroupName="Axes"
-                            IsChecked="{Binding RotAxes[2]}"
-                            Style="{StaticResource ToolBar_ToggleButton}"/>
-            </UniformGrid>
-            <EgtWPFLib5:EgtTextBox Grid.Row="1"
-                                   Text="{Binding sRotAngle, UpdateSourceTrigger=Explicit}"
-                                   Margin="0,5,0,0"/>
-            <Grid Grid.Row="2"
-                  Margin="0,2.5,0,0">
-               <Button Content="Drag"
-                       Command="{Binding DragRotate_Command}"
-                       Style="{StaticResource LeftPanel_TextButton}"/>
-            </Grid>
-         </Grid>
-      </Border>
-   </Popup>-->
 </Grid>
diff --git a/Icarus/DispositionPanel/DispositionPanelVM.vb b/Icarus/DispositionPanel/DispositionPanelVM.vb
index 93028f6..b8f2dbe 100644
--- a/Icarus/DispositionPanel/DispositionPanelVM.vb
+++ b/Icarus/DispositionPanel/DispositionPanelVM.vb
@@ -20,25 +20,7 @@ Public Class DispositionPanelVM
          EgtStartPoint(Map.refTopPanelVM.SelPart.nReferenceId, GDB_ID.ROOT, ptReference)
          Dim dNewXPos As Double = ptReference.x
          StringToLen(value, dNewXPos)
-         Dim b3Print As New BBox3d
-         EgtGetBBoxGlob(Map.refTopPanelVM.SelPart.nPrintSolidId, GDB_BB.EXACT, b3Print)
-         If EgtGetGroupObjs(Map.refTopPanelVM.SelPart.nRibsLayerId) > 0 Then
-            Dim b3Ribs As New BBox3d()
-            Dim nRibId As Integer = EgtGetFirstInGroup(Map.refTopPanelVM.SelPart.nRibsLayerId)
-            While nRibId <> GDB_ID.NULL
-               Dim nRibType As Integer = Machining.MPAR_RIBSTYPE.INTERNAL
-               EgtGetInfo(nRibId, MAC_RIBSTYPE, nRibType)
-               If nRibType = Machining.MPAR_RIBSTYPE.EXTERNAL OrElse nRibType = Machining.MPAR_RIBSTYPE.UNBOUNDED Then
-                  Dim b3Rib As New BBox3d
-                  EgtGetBBoxGlob(nRibId, GDB_BB.EXACT, b3Rib)
-                  b3Ribs.Add(b3Rib)
-               End If
-               nRibId = EgtGetNext(nRibId)
-            End While
-            If b3Ribs.Min.x <> INFINITO Then
-               b3Print.Add(b3Ribs)
-            End If
-         End If
+         Dim b3Print As BBox3d = GetSolidForReferenceBBox(Map.refTopPanelVM.SelPart)
          Dim dMin As Double = 0
          Dim dMax As Double = CurrentMachine.b3Tab.DimX
          If b3Print.Max.x > ptReference.x Then
@@ -47,13 +29,16 @@ Public Class DispositionPanelVM
          If b3Print.Min.x < ptReference.x Then
             dMin += ptReference.x - b3Print.Min.x
          End If
-         If dNewXPos >= dMin AndAlso dNewXPos <= dMax Then
-            EgtMove(Map.refTopPanelVM.SelPart.nPartId, New Point3d(dNewXPos, ptReference.y, ptReference.z) - ptReference, GDB_RT.GLOB)
-            Map.refReferencePanelVM.UpdateFramePosition()
-            EgtDraw()
-         Else
-            NotifyPropertyChanged(NameOf(sXPos))
+         ' riduco a spostamento massimo
+         If dNewXPos < dMin Then
+            dNewXPos = dMin
+         ElseIf dNewXPos > dMax Then
+            dNewXPos = dMax
          End If
+         EgtMove(Map.refTopPanelVM.SelPart.nPartId, New Point3d(dNewXPos, ptReference.y, ptReference.z) - ptReference, GDB_RT.GLOB)
+         Map.refReferencePanelVM.UpdateFramePosition()
+         EgtDraw()
+         NotifyPropertyChanged(NameOf(sXPos))
       End Set
    End Property
 
@@ -72,25 +57,7 @@ Public Class DispositionPanelVM
          EgtStartPoint(Map.refTopPanelVM.SelPart.nReferenceId, GDB_ID.ROOT, ptReference)
          Dim dNewYPos As Double = ptReference.y
          StringToLen(value, dNewYPos)
-         Dim b3Print As New BBox3d
-         EgtGetBBoxGlob(Map.refTopPanelVM.SelPart.nPrintSolidId, GDB_BB.EXACT, b3Print)
-         If EgtGetGroupObjs(Map.refTopPanelVM.SelPart.nRibsLayerId) > 0 Then
-            Dim b3Ribs As New BBox3d()
-            Dim nRibId As Integer = EgtGetFirstInGroup(Map.refTopPanelVM.SelPart.nRibsLayerId)
-            While nRibId <> GDB_ID.NULL
-               Dim nRibType As Integer = Machining.MPAR_RIBSTYPE.INTERNAL
-               EgtGetInfo(nRibId, MAC_RIBSTYPE, nRibType)
-               If nRibType = Machining.MPAR_RIBSTYPE.EXTERNAL OrElse nRibType = Machining.MPAR_RIBSTYPE.UNBOUNDED Then
-                  Dim b3Rib As New BBox3d
-                  EgtGetBBoxGlob(nRibId, GDB_BB.EXACT, b3Rib)
-                  b3Ribs.Add(b3Rib)
-               End If
-               nRibId = EgtGetNext(nRibId)
-            End While
-            If b3Ribs.Min.x <> INFINITO Then
-               b3Print.Add(b3Ribs)
-            End If
-         End If
+         Dim b3Print As BBox3d = GetSolidForReferenceBBox(Map.refTopPanelVM.SelPart)
          Dim dMin As Double = 0
          Dim dMax As Double = CurrentMachine.b3Tab.DimY
          If b3Print.Max.y > ptReference.y Then
@@ -99,13 +66,16 @@ Public Class DispositionPanelVM
          If b3Print.Min.y < ptReference.y Then
             dMin += ptReference.y - b3Print.Min.y
          End If
-         If dNewYPos >= dMin AndAlso dNewYPos <= dMax Then
-            EgtMove(Map.refTopPanelVM.SelPart.nPartId, New Point3d(ptReference.x, dNewYPos, ptReference.z) - ptReference, GDB_RT.GLOB)
-            Map.refReferencePanelVM.UpdateFramePosition()
-            EgtDraw()
-         Else
-            NotifyPropertyChanged(NameOf(sYPos))
+         ' riduco a spostamento massimo
+         If dNewYPos < dMin Then
+            dNewYPos = dMin
+         ElseIf dNewyPos > dMax Then
+            dNewYPos = dMax
          End If
+         EgtMove(Map.refTopPanelVM.SelPart.nPartId, New Point3d(ptReference.x, dNewYPos, ptReference.z) - ptReference, GDB_RT.GLOB)
+         Map.refReferencePanelVM.UpdateFramePosition()
+         EgtDraw()
+         NotifyPropertyChanged(NameOf(sYPos))
       End Set
    End Property
 
@@ -124,16 +94,65 @@ Public Class DispositionPanelVM
          EgtStartPoint(Map.refTopPanelVM.SelPart.nReferenceId, GDB_ID.ROOT, ptReference)
          Dim dNewZPos As Double = ptReference.z
          StringToLen(value, dNewZPos)
-         If dNewZPos >= 0 Then
-            EgtMove(Map.refTopPanelVM.SelPart.nPartId, New Point3d(ptReference.x, ptReference.y, dNewZPos) - ptReference, GDB_RT.GLOB)
-            Map.refReferencePanelVM.UpdateFramePosition()
-            EgtDraw()
-         Else
-            NotifyPropertyChanged(NameOf(sZPos))
+         Dim b3Print As BBox3d = GetSolidForReferenceBBox(Map.refTopPanelVM.SelPart)
+         Dim dMin As Double = 0
+         If b3Print.Min.z < ptReference.z Then
+            dMin += ptReference.z - b3Print.Min.z
          End If
+         ' riduco a spostamento massimo
+         If dNewZPos < dMin Then
+            dNewZPos = dMin
+         End If
+         EgtMove(Map.refTopPanelVM.SelPart.nPartId, New Point3d(ptReference.x, ptReference.y, dNewZPos) - ptReference, GDB_RT.GLOB)
+         Map.refReferencePanelVM.UpdateFramePosition()
+         EgtDraw()
+         NotifyPropertyChanged(NameOf(sZPos))
       End Set
    End Property
 
+   Friend Sub UpdateZPos()
+      Dim ptReference As New Point3d
+      EgtStartPoint(Map.refTopPanelVM.SelPart.nReferenceId, GDB_ID.ROOT, ptReference)
+      Dim dNewZPos As Double = ptReference.z
+      Dim b3Print As BBox3d = GetSolidForReferenceBBox(Map.refTopPanelVM.SelPart)
+      Dim dMin As Double = 0
+      If b3Print.Min.z < ptReference.z Then
+         dMin += ptReference.z - b3Print.Min.z
+      End If
+      If ptReference.z < dMin Then
+         EgtMove(Map.refTopPanelVM.SelPart.nPartId, New Point3d(ptReference.x, ptReference.y, dMin) - ptReference, GDB_RT.GLOB)
+         Map.refDispositionPanelVM.RefreshPos()
+         EgtDraw()
+      End If
+      NotifyPropertyChanged(NameOf(sZPos))
+   End Sub
+
+   ' funzione che calcola il box totale del solido da stampare piu' ribs esterne ed unbounded
+   Friend Function GetSolidForReferenceBBox(SelPart As Print3dPartVM) As BBox3d
+      Dim b3Print As New BBox3d
+      EgtGetBBoxGlob(SelPart.nPrintSolidId, GDB_BB.EXACT, b3Print)
+      If EgtGetGroupObjs(SelPart.nRibsLayerId) > 0 Then
+         Dim b3Ribs As New BBox3d()
+         Dim nRibId As Integer = EgtGetFirstInGroup(SelPart.nRibsLayerId)
+         While nRibId <> GDB_ID.NULL
+            Dim nRibType As Integer = Machining.MPAR_RIBSTYPE.INTERNAL
+            If Not EgtGetInfo(nRibId, MAC_RIBSTYPE, nRibType) Then
+               EgtGetInfo(SelPart.nPartId, MAC_RIBSTYPE, nRibType)
+            End If
+            If nRibType = Machining.MPAR_RIBSTYPE.EXTERNAL OrElse nRibType = Machining.MPAR_RIBSTYPE.UNBOUNDED Then
+               Dim b3Rib As New BBox3d
+               EgtGetBBoxGlob(nRibId, GDB_BB.EXACT, b3Rib)
+               b3Ribs.Add(b3Rib)
+            End If
+            nRibId = EgtGetNext(nRibId)
+         End While
+         If b3Ribs.Min.x <> INFINITO Then
+            b3Print.Add(b3Ribs)
+         End If
+      End If
+      Return b3Print
+   End Function
+
    Private m_RotAxes As Boolean() = { False, False, False}
    Public Property RotX As Boolean
       Get
@@ -198,6 +217,7 @@ Public Class DispositionPanelVM
          If EgtRotate(Map.refTopPanelVM.SelPart.nPartId, b3PrintSolid.Center, vtSelRotAxes, dNewAngle, GDB_RT.GLOB) Then
             m_sRotAngle = 0
             Map.refReferencePanelVM.UpdateFramePosition()
+            Map.refDispositionPanelVM.UpdateZPos()
             RefreshPos()
             EgtDraw()
             NotifyPropertyChanged(NameOf(sRotAngle))
diff --git a/Icarus/MachiningDb/Machining.vb b/Icarus/MachiningDb/Machining.vb
index 4b52a02..88ed44b 100644
--- a/Icarus/MachiningDb/Machining.vb
+++ b/Icarus/MachiningDb/Machining.vb
@@ -169,7 +169,7 @@ Public Class Machining
       NotifyPropertyChanged(NameOf(ghName))
    End Sub
 
-   Friend Sub Save()
+   Friend Overridable Sub Save()
       If bIsModified Then
          ' salvo tutti i parametri su orig
          SaveParams()
@@ -180,7 +180,7 @@ Public Class Machining
       End If
    End Sub
 
-   Private Sub SaveParams()
+   Protected Overridable Sub SaveParams()
       SaveName()
       For Each Cathegory In m_CathegoryList
          Cathegory.SaveParams()
diff --git a/Icarus/MachiningDb/MachiningDbV.xaml b/Icarus/MachiningDb/MachiningDbV.xaml
index 25f34ac..1e94ebf 100644
--- a/Icarus/MachiningDb/MachiningDbV.xaml
+++ b/Icarus/MachiningDb/MachiningDbV.xaml
@@ -11,7 +11,6 @@
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="Auto"/>
-            <RowDefinition Height="1*"/>
             <RowDefinition Height="Auto"/>
          </Grid.RowDefinitions>
          <Grid>
@@ -72,7 +71,7 @@
                <Image Source="/Resources/TopPanel/Edit.png"/>
             </Button>
          </Grid>
-         <ScrollViewer Grid.Row="3"
+         <ScrollViewer Grid.Row="2"
                        VerticalScrollBarVisibility="Auto"
                        HorizontalScrollBarVisibility="Disabled">
             <ItemsControl Grid.Row="1"
@@ -188,31 +187,33 @@
                               <DataTemplate DataType="{x:Type PrintApp:OrderedMachiningParam}">
                                  <Grid>
                                     <Grid.ColumnDefinitions>
+                                       <ColumnDefinition Width="2*"/>
                                        <ColumnDefinition Width="1*"/>
-                                       <ColumnDefinition Width="Auto"/>
                                     </Grid.ColumnDefinitions>
-                                    <Grid.RowDefinitions>
-                                       <RowDefinition Height="Auto"/>
-                                       <RowDefinition Height="Auto"/>
-                                    </Grid.RowDefinitions>
-                                    <TextBlock Text="{Binding sName}"/>
-                                    <StackPanel Grid.Column="1"
-                                                Orientation="Horizontal"
-                                                HorizontalAlignment="Right">
-                                       <Button Content="&lt;>"
-                                               Command="{Binding ResetOrder_Command}"
-                                               Style="{StaticResource ToolBar_SmallButton}"/>
-                                       <Button Content="˄"
-                                               Command="{Binding MoveUpOrder_Command}"
-                                               Style="{StaticResource ToolBar_SmallButton}"/>
-                                       <Button Content="˅"
-                                               Command="{Binding MoveDownOrder_Command}"
-                                               Style="{StaticResource ToolBar_SmallButton}"/>
-                                    </StackPanel>
-                                    <ListBox Grid.ColumnSpan="2"
-                                             Grid.Row="1"
-                                             ItemsSource="{Binding ValueList}"
-                                             SelectedItem="{Binding SelValue}"/>
+                                    <TextBlock Text="{Binding sName}"
+                                               VerticalAlignment="Center"/>
+                                    <Grid Grid.Column="1">
+                                       <Grid.ColumnDefinitions>
+                                          <ColumnDefinition Width="1*"/>
+                                          <ColumnDefinition Width="Auto"/>
+                                       </Grid.ColumnDefinitions>
+                                       <ListBox ItemsSource="{Binding ValueList}"
+                                                SelectedItem="{Binding SelValue}"/>
+                                       <StackPanel Grid.Column="1"
+                                                   Orientation="Vertical"
+                                                   VerticalAlignment="Center"
+                                                   Margin="5,0,0,0">
+                                          <Button Content="˄"
+                                                  Command="{Binding MoveUpOrder_Command}"
+                                                  Style="{StaticResource ToolBar_SmallButton}"/>
+                                          <Button Content="˅"
+                                                  Command="{Binding MoveDownOrder_Command}"
+                                                  Style="{StaticResource ToolBar_SmallButton}"/>
+                                          <Button Content="&lt;>"
+                                                  Command="{Binding ResetOrder_Command}"
+                                                  Style="{StaticResource ToolBar_SmallButton}"/>
+                                       </StackPanel>
+                                    </Grid>
                                  </Grid>
                               </DataTemplate>
                            </ItemsControl.Resources>
@@ -222,7 +223,7 @@
                </ItemsControl.ItemTemplate>
             </ItemsControl>
          </ScrollViewer>
-         <UniformGrid Grid.Row="4" Rows="1">
+         <UniformGrid Grid.Row="3" Rows="1">
             <Button Content="Ok"
                     Command="{Binding Ok_Command}"
                     IsEnabled="{Binding IsEnabled}"
diff --git a/Icarus/ManagePartPanel/ManagePartPanelVM.vb b/Icarus/ManagePartPanel/ManagePartPanelVM.vb
index f8da5a7..a294b78 100644
--- a/Icarus/ManagePartPanel/ManagePartPanelVM.vb
+++ b/Icarus/ManagePartPanel/ManagePartPanelVM.vb
@@ -433,17 +433,9 @@ Public Class ManagePartPanelVM
                            End If
                      End Select
                   Next
-                  ' aggiungo riferimento
+                  ' aggiungo layer riferimento
                   Dim nReferenceLayerId As Integer = EgtCreateGroup(nPartId)
                   EgtSetName(nReferenceLayerId, LAY_REFERENCE)
-                  ' Creo riferimento 
-                  Dim ptOrig As New Point3d(b3PrintSolid.Min())
-                  Dim frPrintSolid As New Frame3d(ptOrig)
-                  nFrameId = EgtCreateGeoFrame(nReferenceLayerId, frPrintSolid, GDB_RT.GLOB)
-                  If nFrameId Then
-                     EgtSetName(nFrameId, FRAME_PART)
-                     EgtSetMode(nFrameId, GDB_MD.LOCKED)
-                  End If
                   EgtSetInfo(nReferenceLayerId, KEY_REFERENCE, ReferenceBtn.References.BL)
                   ' appoggio il pezzo sulla tavola
                   EgtMove(nPartId, New Vector3d(0, 0, -b3PrintSolid.Min.z))
@@ -455,6 +447,8 @@ Public Class ManagePartPanelVM
                   EgtSetInfo(nPartId, "PartOnTable", 1)
                   Dim NewPart As New Print3dPartVM(nPartId, nPrintPartLayerId, nReferenceLayerId, nFrameId, nMachStartLayerId, nRibsLayerId, nShellNumberLayerId, nAuxSolidsLayerId, nOthersLayerId, sFilePath)
                   Map.refTopPanelVM.PartList.Add(NewPart)
+                  ' aggiorno riferimento
+                  Map.refReferencePanelVM.UpdateFramePosition(NewPart)
                Next
             End If
             'EgtAddMachGroup("3dPrint")
diff --git a/Icarus/ManagePartPanel/ManagePartUtility.vb b/Icarus/ManagePartPanel/ManagePartUtility.vb
index 48ac6db..75af836 100644
--- a/Icarus/ManagePartPanel/ManagePartUtility.vb
+++ b/Icarus/ManagePartPanel/ManagePartUtility.vb
@@ -684,44 +684,38 @@ Public Class GeomEntity_MenuItem
                ' creo layer solido di stampa
                Dim nPrintPartLayerId As Integer = EgtCreateGroup(nPartId)
                EgtSetName(nPrintPartLayerId, PRINT_SOLID)
+               EgtSetColor(nPrintPartLayerId, GeomEntityColors.c3Print)
                EgtRelocateGlob(m_OrigEntity.nId, nPrintPartLayerId, GDB_POS.LAST_SON)
                ' calcolo box superficie per creazione riferimento
                EgtGetBBoxGlob(m_OrigEntity.nId, GDB_BB.STANDARD, b3PrintSolid)
-               ' coloro l'entita'
-               EgtSetColor(m_OrigEntity.nId, GeomEntityColors.c3Print)
                ' creo layer mach start
                Dim nMachStartLayerId As Integer = EgtCreateGroup(nPartId)
                EgtSetName(nMachStartLayerId, LAY_MACH_START)
+               EgtSetColor(nMachStartLayerId, GeomEntityColors.c3MachStart)
                Dim nMachStartId As Integer = GDB_ID.NULL
                ' creo punto di partenza
                Dim ptStart As Point3d = b3PrintSolid.Center() - 0.6 * b3PrintSolid.DimY() * Vector3d.Y_AX() - 0.5 * b3PrintSolid.DimZ() * Vector3d.Z_AX()
                nMachStartId = EgtCreateGeoPoint(nMachStartLayerId, ptStart, GDB_RT.GLOB)
                EgtSetName(nMachStartId, START_GEOM)
-               ' coloro l'entita' di rosso
-               EgtSetColor(nMachStartId, GeomEntityColors.c3MachStart)
                ' creo layer ribs
                Dim nRibsLayerId As Integer = EgtCreateGroup(nPartId)
                EgtSetName(nRibsLayerId, LAY_RIBS)
+               EgtSetColor(nRibsLayerId, GeomEntityColors.c3Rib)
                ' creo layer shell number
                Dim nShellNumberLayerId As Integer = EgtCreateGroup(nPartId)
                EgtSetName(nShellNumberLayerId, LAY_SHELL_NBR)
+               EgtSetColor(nShellNumberLayerId, GeomEntityColors.c3ShellNumber)
                ' creo layer aux
                Dim nAuxSolidsLayerId As Integer = EgtCreateGroup(nPartId)
                EgtSetName(nAuxSolidsLayerId, LAY_AUX_SOLIDS)
+               EgtSetColor(nAuxSolidsLayerId, GeomEntityColors.c3AuxSolids)
                ' creo layer others
                Dim nOthersLayerId As Integer = EgtCreateGroup(nPartId)
                EgtSetName(nOthersLayerId, LAY_OTHERS)
+               EgtSetColor(nOthersLayerId, GeomEntityColors.c3Others)
                ' aggiungo riferimento
                Dim nReferenceLayerId As Integer = EgtCreateGroup(nPartId)
                EgtSetName(nReferenceLayerId, LAY_REFERENCE)
-               ' Creo riferimento 
-               Dim ptOrig As New Point3d(b3PrintSolid.Min())
-               Dim frPrintSolid As New Frame3d(ptOrig)
-               nFrameId = EgtCreateGeoFrame(nReferenceLayerId, frPrintSolid, GDB_RT.GLOB)
-               If nFrameId Then
-                  EgtSetName(nFrameId, FRAME_PART)
-                  EgtSetMode(nFrameId, GDB_MD.LOCKED)
-               End If
                EgtSetInfo(nReferenceLayerId, KEY_REFERENCE, ReferenceBtn.References.BL)
                ' appoggio il pezzo sulla tavola
                EgtMove(nPartId, New Vector3d(0, 0, -b3PrintSolid.Min.z))
@@ -730,6 +724,8 @@ Public Class GeomEntity_MenuItem
                EgtSetInfo(nPartId, "PartOnTable", 1)
                Dim NewPart As New Print3dPartVM(nPartId, nPrintPartLayerId, nReferenceLayerId, nFrameId, nMachStartLayerId, nRibsLayerId, nShellNumberLayerId, nAuxSolidsLayerId, nOthersLayerId, sFilePath)
                Map.refTopPanelVM.PartList.Add(NewPart)
+               ' aggiorno riferimento
+               Map.refReferencePanelVM.UpdateFramePosition(NewPart)
                Dim ManagePart_Part As ManagePart_Part = New ManagePart_Part(NewPart)
                ' elimino da posizione originale
                m_OrigEntity.OrigLayer.EntityList.Remove(m_OrigEntity)
@@ -768,6 +764,7 @@ Public Class GeomEntity_MenuItem
             ' aggiorno riferimenti nel context menu item
             m_OrigEntity.UpdateContextMenu()
          Case ManagePartPanelVM.ManagePartType.MODIFY
+            Dim bIsMovedRib As Boolean = False
             ' recupero layer da pezzo
             Dim nLayerId As Integer = GDB_ID.NULL
             Select Case m_Type
@@ -802,6 +799,7 @@ Public Class GeomEntity_MenuItem
                   Case ManagePart_Layer.LayerType.RIBS
                      EgtRemoveInfo(m_OrigEntity.nId, KEY_RIB_TYPE)
                      EgtRemoveInfo(m_OrigEntity.nId, RIB_ID)
+                     bIsMovedRib = True
                   Case ManagePart_Layer.LayerType.SHELL_NUMBER
                      EgtRemoveInfo(m_OrigEntity.nId, KEY_SHELLNBR_TYPE)
                   Case ManagePart_Layer.LayerType.AUX_SOLIDS
@@ -836,6 +834,7 @@ Public Class GeomEntity_MenuItem
                      EgtSetInfo(m_OrigEntity.nId, KEY_RIB_TYPE, RibEntity.RibTypes.FROMIMPORT)
                      EgtSetInfo(m_OrigEntity.nId, RIB_ID, RibPanelVM.GetNextRibIndex())
                      EgtSetColor(m_OrigEntity.nId, c3Rib)
+                     bIsMovedRib = True
                   Case ManagePart_Layer.LayerType.SHELL_NUMBER
                      EgtSetName(m_OrigEntity.nId, LAY_SHELL_NBR)
                      EgtSetInfo(m_OrigEntity.nId, KEY_SHELLNBR_TYPE, ShellNumberEntity.ShellNumberTypes.FROMIMPORT)
@@ -848,6 +847,11 @@ Public Class GeomEntity_MenuItem
                      EgtSetName(m_OrigEntity.nId, LAY_OTHERS)
                      EgtSetColor(m_OrigEntity.nId, c3Others)
                End Select
+               ' se spostato un Rib, aggiorno posizione riferimento e pezzo
+               If bIsMovedRib Then
+                  Map.refReferencePanelVM.UpdateFramePosition(NewPart.PrintPart)
+                  Map.refDispositionPanelVM.UpdateZPos()
+               End If
                EgtDraw()
                ' aggiorno riferimenti nel context menu item
                If bUpdateAllContextMenu Then
diff --git a/Icarus/ReferencePanel/ReferencePanelVM.vb b/Icarus/ReferencePanel/ReferencePanelVM.vb
index 9804950..d816440 100644
--- a/Icarus/ReferencePanel/ReferencePanelVM.vb
+++ b/Icarus/ReferencePanel/ReferencePanelVM.vb
@@ -30,6 +30,7 @@ Public Class ReferencePanelVM
       End Get
       Set(value As ReferenceBtn)
          m_SelReference = value.Type
+         EgtSetInfo(Map.refTopPanelVM.SelPart.nReferenceLayerId, KEY_REFERENCE, value.Type)
          UpdateFramePosition()
       End Set
    End Property
@@ -68,41 +69,44 @@ Public Class ReferencePanelVM
    End Sub
 
    Friend Sub UpdateFramePosition(Optional SelPart As Print3dPartVM = Nothing)
-      If IsNothing(SelPart) Then SelPart = Map.refTopPanelVM.SelPart
+      Dim SelReference As Integer = ReferenceBtn.References.BL
+      If IsNothing(SelPart) Then
+         SelPart = Map.refTopPanelVM.SelPart
+      End If
+      EgtGetInfo(SelPart.nReferenceLayerId, KEY_REFERENCE, SelReference)
       ' elimino precedente
       EgtEmptyGroup(SelPart.nReferenceLayerId)
       ' Creo riferimento 
       Dim frPrintSolid As New Frame3d()
-      If m_SelReference = ReferenceBtn.References.FROM_IMPORT Then
+      If SelReference = ReferenceBtn.References.FROM_IMPORT Then
          EgtGetGlobFrame(SelPart.nPrintSolidId, frPrintSolid)
          frPrintSolid.Setup(New Point3d(frPrintSolid.Orig.x, frPrintSolid.Orig.y, 0))
       Else
-         Dim b3PrintSolid As New BBox3d
-         EgtGetBBoxGlob(SelPart.nPrintSolidId, GDB_BB.STANDARD, b3PrintSolid)
+         Dim b3ToBePrintSolid As BBox3d = Map.refDispositionPanelVM.GetSolidForReferenceBBox(SelPart)
          ' Creo riferimento 
-         Dim ptOrig As New Point3d(b3PrintSolid.Min())
-         Select Case m_SelReference
+         Dim ptOrig As New Point3d(b3ToBePrintSolid.Min())
+         Select Case SelReference
             Case ReferenceBtn.References.TL
-               ptOrig += b3PrintSolid.DimY() * Vector3d.Y_AX
+               ptOrig += b3ToBePrintSolid.DimY() * Vector3d.Y_AX
             Case ReferenceBtn.References.TR
-               ptOrig += b3PrintSolid.DimY() * Vector3d.Y_AX + b3PrintSolid.DimX() * Vector3d.X_AX
+               ptOrig += b3ToBePrintSolid.DimY() * Vector3d.Y_AX + b3ToBePrintSolid.DimX() * Vector3d.X_AX
             Case ReferenceBtn.References.BL
             Case ReferenceBtn.References.BR
-               ptOrig += b3PrintSolid.DimX() * Vector3d.X_AX
+               ptOrig += b3ToBePrintSolid.DimX() * Vector3d.X_AX
             Case ReferenceBtn.References.TC
-               ptOrig += b3PrintSolid.DimY() * Vector3d.Y_AX + b3PrintSolid.DimX() / 2 * Vector3d.X_AX
+               ptOrig += b3ToBePrintSolid.DimY() * Vector3d.Y_AX + b3ToBePrintSolid.DimX() / 2 * Vector3d.X_AX
             Case ReferenceBtn.References.ML
-               ptOrig += b3PrintSolid.DimY() / 2 * Vector3d.Y_AX
+               ptOrig += b3ToBePrintSolid.DimY() / 2 * Vector3d.Y_AX
             Case ReferenceBtn.References.MR
-               ptOrig += b3PrintSolid.DimY() / 2 * Vector3d.Y_AX + b3PrintSolid.DimX() * Vector3d.X_AX
+               ptOrig += b3ToBePrintSolid.DimY() / 2 * Vector3d.Y_AX + b3ToBePrintSolid.DimX() * Vector3d.X_AX
             Case ReferenceBtn.References.TC
-               ptOrig += b3PrintSolid.DimY() * Vector3d.Y_AX + b3PrintSolid.DimX() / 2 * Vector3d.X_AX
+               ptOrig += b3ToBePrintSolid.DimY() * Vector3d.Y_AX + b3ToBePrintSolid.DimX() / 2 * Vector3d.X_AX
             Case ReferenceBtn.References.MR
-               ptOrig += b3PrintSolid.DimY() / 2 * Vector3d.Y_AX + b3PrintSolid.DimX() * Vector3d.X_AX
+               ptOrig += b3ToBePrintSolid.DimY() / 2 * Vector3d.Y_AX + b3ToBePrintSolid.DimX() * Vector3d.X_AX
             Case ReferenceBtn.References.BC
-               ptOrig += b3PrintSolid.DimX() / 2 * Vector3d.X_AX
+               ptOrig += b3ToBePrintSolid.DimX() / 2 * Vector3d.X_AX
             Case ReferenceBtn.References.MC
-               ptOrig += b3PrintSolid.DimY() / 2 * Vector3d.Y_AX + b3PrintSolid.DimX() / 2 * Vector3d.X_AX
+               ptOrig += b3ToBePrintSolid.DimY() / 2 * Vector3d.Y_AX + b3ToBePrintSolid.DimX() / 2 * Vector3d.X_AX
          End Select
          Dim vtMovedPart As Vector3d
          EgtGetInfo(SelPart.nPartId, "MovedPart", vtMovedPart)
@@ -115,7 +119,6 @@ Public Class ReferencePanelVM
          EgtSetMode(nFrameId, GDB_MD.LOCKED)
          SelPart.UpdateReferenceId(nFrameId)
       End If
-      EgtSetInfo(SelPart.nReferenceLayerId, KEY_REFERENCE, m_SelReference)
       Map.refDispositionPanelVM.RefreshPos()
       EgtDraw()
    End Sub
diff --git a/Icarus/RibParamPanel/RibParamPanelVM.vb b/Icarus/RibParamPanel/RibParamPanelVM.vb
index f596e53..8abc573 100644
--- a/Icarus/RibParamPanel/RibParamPanelVM.vb
+++ b/Icarus/RibParamPanel/RibParamPanelVM.vb
@@ -112,6 +112,12 @@ Public Class RibParamPanelVM
 
    Public Sub Ok()
       If Not IsNothing(Map.refRibPanelVM.SelRib) Then
+         ' verifico se modificata tipologia Ribs
+         Dim bIsModifiedRibsType As Boolean = False
+         Dim RibsTypeParam As MachiningParam = MachiningParamList.FirstOrDefault(Function(y) y.Type = MachiningParam.Params.RIBSTYPE)
+         If Not IsNothing(RibsTypeParam) Then
+            bIsModifiedRibsType = RibsTypeParam.bIsModified
+         End If
          ' scrivo i parametri modificati
          Select Case Map.refRibPanelVM.SelRib.Type
             Case RibEntity.RibTypes.FROMDRAW
@@ -120,6 +126,12 @@ Public Class RibParamPanelVM
             Case RibEntity.RibTypes.FROMIMPORT
                WriteParamsInRib(Map.refRibPanelVM.SelRib.nExtrusionId)
          End Select
+         SaveCurrParams()
+         ' se modificata tipologia Ribs, aggiorno posizione riferimento e pezzo
+         If bIsModifiedRibsType Then
+            Map.refReferencePanelVM.UpdateFramePosition()
+            Map.refDispositionPanelVM.UpdateZPos()
+         End If
       End If
       ' ripristino modalita' standard
       Map.refRightPanelVM.SetSelPanel(RightPanelVM.Panels.NULL)
diff --git a/Icarus/SceneHost/MySceneHostVM.vb b/Icarus/SceneHost/MySceneHostVM.vb
index d87cab5..28036c8 100644
--- a/Icarus/SceneHost/MySceneHostVM.vb
+++ b/Icarus/SceneHost/MySceneHostVM.vb
@@ -451,7 +451,8 @@ Public Class MySceneHostVM
             ' elimino colore entita'
             EgtResetColor(nNewEntityId)
             ' aggiorno riferimento pezzo
-            Map.refReferencePanelVM.UpdateFramePosition(MenuItem.OrigLayer.OrigPart.PrintPart)
+            Map.refReferencePanelVM.UpdateFramePosition()
+            Map.refDispositionPanelVM.UpdateZPos()
             ' elimino eventuale flag di spostamento a 45 gradi
             EgtRemoveInfo(MenuItem.OrigLayer.OrigPart.PrintPart.nPartId, "MovedPart")
             ' elimino vecchio elemento ed aggiungo nuovo