[Bug 6006] incorrect paint of invisible buttons

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=6006

[e-mail] changed:

What    |Removed                     |Added
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Attachment #4773 is|0                           |1
           obsolete|                            |

------- Additional Comments From [e-mail]  2007-11-02 23:44 -------
(From update of attachment 4773)
The problem exposed by this attached code has been captured in bug 7360.

It appears that this issue is different.
I'm suspecting the problem with the shown buttons (which are supposed to be
invisible) is the result of a missing WM_NCPAINT/WM_ERASEBKGND message instead
of an extra WM_ERASEBKGND as demonstrated in bug 7360.