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Drawings in front of an image

Greetings!
I'm developing a multiple forms application in Microsoft Visual Studio
C++ .NET 2003. I have a problems with graphics: I draw my diagrams in a
pictureBox using its paint event and using the Invalidate() function to
call it. It works very well.
What I need now is drawing (for example) a rectangle over this image
(the diagrams) and afterwards (with a click button, for example) erase
it again. But my diagrams in the background must continue there. I'd
thank very much for any idea of how I could do that.

Nov 17 '05 #1
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