theming: combobox

[Frank Richter]

This one uses the approach to draw parts of a control (in this case, the
dropdown button) by sending a WM_NOTIFY/NM_CUSTOMDRAW to the window
itself. The subclassed window proc then can intercept that message to do
the theming.

Feedback would be appreciated.

Frank Richter <frank.richter at gmail.com>
Add initial combo box theming.


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