Re: Drop-down list with CBS_DROPDOWNLIST | CBS_OWNERDRAWVARIABLE in Vista

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Hi Arno,

I finally got feedback from the current Combobox developer, below is his
comment:

"For compatibility comboboxes with ownerdraw style fallback to old painting
code and they look similarly to XP. In such case there is no "button" look
for CBS_DROPDOWNLIST.

I would leave ownerdraw style to paint content of drop-down listbox in
WM_DRAWITEM handler as it is done currently.

To have this new "button" look for CBS_DROPDOWNLIST your user has to
subclass combobox (http://msdn2.microsoft.com/en-us/library/ms997565.aspx)
and handle WM_PAINT message. Then he has to paint combobox himself using
DrawThemeBackground and BeginBufferedAnimation in WM_PAINT handler. This is
not easy and there is no guarantee that it will work in next version of
Windows but unfortunately there is no better way now :("

So it seems that there is a dark area without perfect solution. Microsoft
PSS may have some better solution.

Thanks for your understanding.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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