uxtheme: cause themed buttons to paint correctly.

[Robert Grocott]

(Tried sending this yesterday, but it wasn't showing up on the Archives 
page for some reason, so I'm resending it. If this results in a 
duplicate message, sorry.)

The attached patch fixes an unreported bug: themed button controls will 
redraw themselves in the unthemed style on mousedown and mouseup (as 
well as a few other, rarer events). This was due to various button 
message handlers invoking the unthemed renderer directly, rather than 
deferring to WM_PAINT.

Robert Grocott

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