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stuff in new window disappears

This is probably a FAQ; seems to me I knew the answer to this once.  

I create a window and immediately draw to it, but my drawing disappears a
split-second later.  Why?  How do I fix this?  My current hack is (sleep 1)
before drawing.  

I seem to recall something *like* (FORCE-blah <window>) is needed, but I
can't remember what it is and I couldn't find anything in the manual.