diff --git a/Application.xaml.vb b/Application.xaml.vb
index 88ca3a5..9a9a772 100644
--- a/Application.xaml.vb
+++ b/Application.xaml.vb
@@ -107,6 +107,7 @@ Class Application
    Friend Const SWEPT As String = "Swept"
    Friend Const MERGESURF As String = "MergeSurf"
    Friend Const EXPLODESURF As String = "ExplodeSurf"
+   Friend Const APPROXSURF As String = "ApproxSurf"
    Friend Const INVERTSURF As String = "InvertSurf"
    Friend Const DELETE As String = "Delete"
    Friend Const CHANGELAYER As String = "ChangeLayer"
diff --git a/DrawPanel/DrawPanelV.xaml b/DrawPanel/DrawPanelV.xaml
index e7a33ad..b5fa3bb 100644
--- a/DrawPanel/DrawPanelV.xaml
+++ b/DrawPanel/DrawPanelV.xaml
@@ -170,6 +170,11 @@
                Command="{Binding InvertSurfCommand}" IsEnabled="{Binding bSelOk}">
                <Image Source="/Resources/DrawPanel/InvertSurf.png" Stretch="Uniform"/>
             </Button>
+            <Button ToolTip="{Binding ApproxSurfToolTip}" Style="{StaticResource DrawPanelButton}"
+               ToolTipService.ShowOnDisabled="True"
+               Command="{Binding ApproxSurfCommand}" IsEnabled="{Binding bSelOk}">
+               <Image Source="/Resources/DrawPanel/ApproxSurf.png" Stretch="Uniform"/>
+            </Button>
          </UniformGrid>
       </Expander>
       <Expander Name="Modify" Style="{StaticResource ExpanderStyle}" Grid.Row="2" IsExpanded="{Binding ModifyIsExpanded}">
diff --git a/DrawPanel/DrawPanelVM.vb b/DrawPanel/DrawPanelVM.vb
index 19f30ef..00f57a3 100644
--- a/DrawPanel/DrawPanelVM.vb
+++ b/DrawPanel/DrawPanelVM.vb
@@ -146,6 +146,11 @@ Public Class DrawPanelVM
          Return EgtMsg( 5221)         'Esplodi Superfici e Regioni Piane
       End Get
    End Property
+   Public ReadOnly Property ApproxSurfToolTip As String
+      Get
+         Return EgtMsg( 5165)         'Approssima Superfici e Regioni Piane
+      End Get
+   End Property
    Public ReadOnly Property ExtractSurfFacetToolTip As String
       Get
          Return EgtMsg( 5158)         'Estrai Faccia da Superficie
@@ -448,6 +453,7 @@ Public Class DrawPanelVM
    Private m_cmdRuled As ICommand
    Private m_cmdMergeSurf As ICommand
    Private m_cmdExplodeSurf As ICommand
+   Private m_cmdApproxSurf As ICommand
    Private m_cmdExtractSurfFacet As ICommand
    Private m_cmdInvertSurf As ICommand
    Private m_cmdExtractLoops As ICommand
@@ -1146,7 +1152,7 @@ Public Class DrawPanelVM
    ''' </summary>
    Public Sub ExplodeSurf(ByVal param As Object)
       If (Keyboard.Modifiers And ModifierKeys.Shift) = ModifierKeys.Shift Then
-         Map.refProjectVM.GetController.ExecuteCommand(Controller.CMD.EXTRACTSURFFACET)
+         Map.refProjectVM.GetController.ExecuteCommand(Controller.CMD.SURFTMTOTRIANGLES)
       Else
          Map.refProjectVM.GetController.ExecuteCommand(Controller.CMD.EXPLODESURF)
       End If
@@ -1154,6 +1160,29 @@ Public Class DrawPanelVM
 
 #End Region ' ExplodeSurfCommand
 
+#Region "ApproxSurfCommand"
+
+   ''' <summary>
+   ''' Returns a command that do ApproxSurf.
+   ''' </summary>
+   Public ReadOnly Property ApproxSurfCommand As ICommand
+      Get
+         If m_cmdApproxSurf Is Nothing Then
+            m_cmdApproxSurf = New RelayCommand(AddressOf ApproxSurf)
+         End If
+         Return m_cmdApproxSurf
+      End Get
+   End Property
+
+   ''' <summary>
+   ''' Execute the ApproxSurf.  This method is invoked by the ApproxSurfCommand.
+   ''' </summary>
+   Public Sub ApproxSurf(ByVal param As Object)
+      Map.refProjectVM.GetController.ExecuteCommand(Controller.CMD.APPROXSURF)
+   End Sub
+
+#End Region ' ApproxSurfCommand
+
 #Region "ExtractSurfFacetCommand"
 
    ''' <summary>
@@ -1175,7 +1204,7 @@ Public Class DrawPanelVM
       Map.refProjectVM.GetController.ExecuteCommand(Controller.CMD.EXTRACTSURFFACET)
    End Sub
 
-#End Region ' ExplodeSurfCommand
+#End Region ' ExtractSurfFacetCommand
 
 #Region "InvertSurfCommand"
 
diff --git a/EgtCAM5.vbproj b/EgtCAM5.vbproj
index adf4ca4..e7d53a7 100644
--- a/EgtCAM5.vbproj
+++ b/EgtCAM5.vbproj
@@ -956,6 +956,9 @@
   <ItemGroup>
     <Resource Include="Resources\DrawPanel\ModifyArcRadius.png" />
   </ItemGroup>
+  <ItemGroup>
+    <Resource Include="Resources\DrawPanel\ApproxSurf.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/MainWindow/MainWindowVM.vb b/MainWindow/MainWindowVM.vb
index bd93286..8c6697d 100644
--- a/MainWindow/MainWindowVM.vb
+++ b/MainWindow/MainWindowVM.vb
@@ -355,8 +355,8 @@ Public Class MainWindowVM
       EgtUILib.GetPrivateProfileString( S_LICENCE, K_NESTKEY, "", sNestKey, sLicFile)
       EgtSetNestKey( sNestKey)
       ' Recupero livello e opzioni della chiave
-      Dim bKey As Boolean = EgtGetKeyLevel(3279, 2410, 1, IniFile.m_nKeyLevel) And
-                            EgtGetKeyOptions(3279, 2410, 1, IniFile.m_nKeyOptions)
+      Dim bKey As Boolean = EgtGetKeyLevel(3279, 2411, 1, IniFile.m_nKeyLevel) And
+                            EgtGetKeyOptions(3279, 2411, 1, IniFile.m_nKeyOptions)
       ' Leggo e imposto livello utilizzatore
       IniFile.m_nUserLevel = Math.Min(IniFile.m_nKeyLevel, GetPrivateProfileInt(S_GENERAL, K_USERLEVEL, 1))
       ' Inizializzazione generale di EgtInterface
diff --git a/My Project/AssemblyInfo.vb b/My Project/AssemblyInfo.vb
index d4e057d..a3fcde8 100644
--- a/My Project/AssemblyInfo.vb	
+++ b/My Project/AssemblyInfo.vb	
@@ -70,6 +70,6 @@ Imports System.Windows
 ' by using the '*' as shown below:
 ' <Assembly: AssemblyVersion("1.0.*")> 
 
-<Assembly: AssemblyVersion("2.4.10.4")>
-<Assembly: AssemblyFileVersion("2.4.10.4")>
+<Assembly: AssemblyVersion("2.4.11.1")>
+<Assembly: AssemblyFileVersion("2.4.11.1")>
 
diff --git a/Resources/DrawPanel/ApproxSurf.png b/Resources/DrawPanel/ApproxSurf.png
new file mode 100644
index 0000000..9cea7e1
Binary files /dev/null and b/Resources/DrawPanel/ApproxSurf.png differ