I am trying to display an alignment overlay that displays vertical/horizontal lines (from existing shapenodes in diagram), while I am dragging around a new node ( Similar to any screen designer).  The problem is I am using the DrawNode event to paint code outside the bounds of the moving node and getting strange results (lines do not appear sometimes or in wrong spots). I have set the ShapeNodes.CustomDraw = CustomDraw.Additional2, which according to docs does not have clipping region applied.   I need a way to draw graphics anywhere on diagram after the diagram has been rendered.

Thank you, that worked.  Had to call diagram.invalidate( true) in this event to make it work. Again thank you for you very fast response.