m a TreeView:
   If Not (nodeDrag Is Nothing) Then

      ' If so, then see if it is coming from the
      ' selected control.  If it is, then allow
      ' the move, otherwise don't allow it:
      If (nodeDrag.Owner.hwnd = tvwSelected.hwnd) Then
         Effect = vbDropEffectMove
      End If

   End If
   
End Sub
</pre><p>
The multi-control drag drop sample provides a reasonably full-featured
sample of using this functionality.  You can drag from the source TreeView
to make copies in the selected TreeVi