diff --git a/EgtCAM5.vbproj b/EgtCAM5.vbproj
index f3f7af7..9dc928f 100644
--- a/EgtCAM5.vbproj
+++ b/EgtCAM5.vbproj
@@ -1014,6 +1014,9 @@
   <ItemGroup>
     <Resource Include="Resources\DrawPanel\ChangeStatus.png" />
   </ItemGroup>
+  <ItemGroup>
+    <Resource Include="Resources\GridViewPanel\CplaneINVERT.png" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.VisualBasic.targets" />
   <PropertyGroup>
     <PostBuildEvent>IF "$(PlatformName)"=="x86" IF "$(ConfigurationName)" == "Release" copy $(TargetPath) c:\EgtProg\EgtCAM5\EgtCAM5R32.exe
diff --git a/GridPanel/GridPanelVM.vb b/GridPanel/GridPanelVM.vb
index 10b3910..1f37845 100644
--- a/GridPanel/GridPanelVM.vb
+++ b/GridPanel/GridPanelVM.vb
@@ -12,13 +12,8 @@ Public Class GridPanelVM
    Private m_cmdCPlaneBack As ICommand
    Private m_cmdCPlaneLeft As ICommand
    Private m_cmdCPlaneBottom As ICommand
-   Private m_cmdCPlaneView As ICommand
    Private m_cmdCPlaneElevation As ICommand
    Private m_cmdCPlaneOrigin As ICommand
-   Private m_cmdCPlaneRotate As ICommand
-   Private m_cmdCPlane3P As ICommand
-   Private m_cmdCPlanePerpObj As ICommand
-   Private m_cmdCPlaneObj As ICommand
 
 #Region "ToolTip"
 
diff --git a/PopUpGridPanel/PopUpGridPanelV.xaml b/PopUpGridPanel/PopUpGridPanelV.xaml
index d002967..aa8b2fb 100644
--- a/PopUpGridPanel/PopUpGridPanelV.xaml
+++ b/PopUpGridPanel/PopUpGridPanelV.xaml
@@ -6,6 +6,9 @@
       <Button Command="{Binding CPlaneViewCommand}" ToolTip="{Binding CPlaneViewToolTip}" Style="{StaticResource GridViewPanelButton}">
          <Image Source="/Resources/GridViewPanel/CplaneView.png" Stretch="Uniform"/>
       </Button>
+      <Button Command="{Binding CPlaneInvertCommand}" ToolTip="{Binding CPlaneInvertToolTip}" Style="{StaticResource GridViewPanelButton}">
+         <Image Source="/Resources/GridViewPanel/CplaneInvert.png" Stretch="Uniform"/>
+      </Button>
       <Button Command="{Binding CPlaneRotateCommand}" ToolTip="{Binding CPlaneRotateToolTip}" Style="{StaticResource GridViewPanelButton}">
          <Image Source="/Resources/GridViewPanel/CplaneROTATE.png" Stretch="Uniform"/>
       </Button>
diff --git a/PopUpGridPanel/PopUpGridPanelViewModel.vb b/PopUpGridPanel/PopUpGridPanelViewModel.vb
index 89599bb..77bc96f 100644
--- a/PopUpGridPanel/PopUpGridPanelViewModel.vb
+++ b/PopUpGridPanel/PopUpGridPanelViewModel.vb
@@ -7,6 +7,7 @@ Public Class PopUpGridPanelVM
 
    ' Definizione comandi
    Private m_cmdCPlaneView As ICommand
+   Private m_cmdCPlaneInvert As ICommand
    Private m_cmdCPlaneRotate As ICommand
    Private m_cmdCPlane3P As ICommand
    Private m_cmdCPlanePerpObj As ICommand
@@ -19,6 +20,11 @@ Public Class PopUpGridPanelVM
          Return EgtMsg(MSG_GRIDVIEWPANEL + 25)
       End Get
    End Property
+   Public ReadOnly Property CPlaneInvertToolTip As String
+      Get
+         Return EgtMsg(5285)
+      End Get
+   End Property
    Public ReadOnly Property CPlaneRotateToolTip As String
       Get
          Return EgtMsg(MSG_GRIDVIEWPANEL + 28)
@@ -70,6 +76,29 @@ Public Class PopUpGridPanelVM
 
 #End Region ' CPlaneViewCommand
 
+#Region "CPlaneInvertCommand"
+
+   ''' <summary>
+   ''' Returns a command that do CPlaneInvert.
+   ''' </summary>
+   Public ReadOnly Property CPlaneInvertCommand As ICommand
+      Get
+         If m_cmdCPlaneInvert Is Nothing Then
+            m_cmdCPlaneInvert = New RelayCommand(AddressOf CPlaneInvert)
+         End If
+         Return m_cmdCPlaneInvert
+      End Get
+   End Property
+
+   ''' <summary>
+   ''' Execute the CPlaneInvert.  This method is invoked by the CPlaneInvertCommand.
+   ''' </summary>
+   Public Sub CPlaneInvert(ByVal param As Object)
+      Map.refProjectVM.GetController.ExecuteCommand(Controller.CMD.GRID_INVERT)
+   End Sub
+
+#End Region
+
 #Region "CPlaneRotateCommand"
 
    ''' <summary>
diff --git a/Resources/GridViewPanel/CplaneINVERT.png b/Resources/GridViewPanel/CplaneINVERT.png
new file mode 100644
index 0000000..0a05f66
Binary files /dev/null and b/Resources/GridViewPanel/CplaneINVERT.png differ