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When I move another windowA over windowB, things I draw on <br />
WindowB will get erased. &nbsp;How can I catch the &quot;expose&quot; event<br />
on Window B so that I can redraw WindowB ? &nbsp;Does it tell me<br />
which part of WindowB are being exposed so I only redraw<br />
that part ? 
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When I move another windowA over windowB, things I draw on 
WindowB will get erased.  How can I catch the "expose" event
on Window B so that I can redraw WindowB ?  Does it tell me
which part of WindowB are being exposed so I only redraw
that part ? 

Catching window expose event

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