Public Class ManagePartPanelV

   Protected Sub Item_ContextMenuOpening(sender As Object, e As ContextMenuEventArgs)
      Dim PartItem As ManagePart_Part
      Dim LayerItem As ManagePart_Layer
      Dim EntityItem As PartManager_GeomEntity
      Select Case e.OriginalSource.DataContext.GetType()
         Case GetType(ManagePart_Part)
            PartItem = DirectCast(e.OriginalSource.DataContext, ManagePart_Part)
            If PartItem.MenuList.Count = 0 Then
               e.Handled = True
            End If
         Case GetType(ManagePart_Layer)
            LayerItem = DirectCast(e.OriginalSource.DataContext, ManagePart_Layer)
            If LayerItem.Type <> ManagePart_Layer.LayerType.PRINT_SOLID OrElse LayerItem.MenuList.Count = 0 Then
               e.Handled = True
            End If
         Case GetType(PartManager_GeomEntity)
            EntityItem = DirectCast(e.OriginalSource.DataContext, PartManager_GeomEntity)
            If EntityItem.MenuList.Count = 0 Then
               e.Handled = True
            End If
      End Select
   End Sub

End Class