I have some 2012 VB.net code that worked fine.  However, it doesn't seem to be working now... any ideas what the problem is?

The working parts of the code are shown below.  When an entity is selected on a SW model part, the msrcPartDoc function is never called.

Any ideas why not?

Friend Class Form1

    Inherits System.Windows.Forms.Form

    Dim WithEvents msrcPartDoc As SldWorks.PartDoc

    Private Function msrcPartDoc_NewSelectionNotify() As Integer

        'Capture & process mouse strokes msrcAssemblyDoc

          {code}

   End Sub

End Class

I really appreciate any suggestions.