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odd form background image behavior

I have a picture on the form background
and a panel which can be moved by the user by dragging it.

Various dialogs are also opened and closed by the user.

Why is it that after a dialog is closed, anytime a user moves the
panel, the area that contained the last dialog opened flashes
the background color through the picture.

It doesnt make any sense to me that even if I do a Form1.Invalidat e()
this odd behavior still occurs.
Nov 16 '05 #1
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