So I'm making a frame which draws a bitmap that can be replaced at runtime so 
if you call (send my-frame set-bitmap *bitmap*) it will switch from displaying 
whatever bitmap you had previously to the bitmap you passed it. (its doing a 
lot of other stuff and I want the interface to this canvas that's drawing the 
bitmap to be through the frame) At least that's the theory. In practice, 
whenever I call (send my-frame show #t) the bitmap that's being drawn is locked 
permanently. Doesn't matter if the paint-callback fetches the bitmap 
dynamically or if I draw in the bitmap's dc. I know the bitmap is getting 
updated or switched. Is there something I'm missing or a technique I should be 

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