blended 
> on the background. If the bar background is transparent and button 
> uses a PNG, would that be blended with the background then?


Only with the background to the bar itself.

To the best of my knowledge, a program cannot blend with other 
processes windows except by setting the window transparency, and it 
must be set to one value.


So how does the system shadow do it?  I don't know.  Could be some 
combination of
- setregion for rounded corners
- a variable background colour.  You could test this by having a 
gradient on the vertical shadow bar
- an almost fully transparent background which displays a bit map 
which in turn as variable alpha with more blending at the edges

Does anyone know?






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