Calling WM_PAINT or its equivalent with a Button Control

[hoxsiew]

what is the "case WM_PAINT:" doing in your button handler? It should be a separate case on the same level as WM_COMMAND. What you need to do is ONLY paint in the WM_PAINT handler (the correct one). Use a flag that can be set in your button handler that tells your WM_PAINT routine what bitmap to paint, then call Invalidate() to force a repaint.