Mod-2 DBuf
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Hi Jim:
The SimpleDBuf module works such that when you draw to the screen's RastPort
the output goes to the alternate buffer. The FlipDBufScreen() procedure
swaps the BitMap ptrs in the RastPort and ViewPort, however if you have
opened a window the window's RastPort will not be swapped. My recomendation
is to avoid using menus on double-buffered screens. If you decide to do it
though make sure the window's RastPort BitMap ptr is set to the correct
bitmap.