If you're filling the background yourself, remember to either do it in OnEraseBkgnd or to not do it at all use:
BOOL CMyDlgOrControl::OnEraseBkgnd(CDC* pDC) {return TRUE;}
If you're filling it black or white use:
PatBlt(Rect.left, Rect.top, Rect.Width(), Rect.Height(), BLACKNESS);
or:
PatBlt(Rect.left, Rect.top, Rect.Width(), Rect.Height(), WHITENESS);
to fill with the current dialog background colour use:
dc.FillSolidRect(&Rect, GetSysColor(COLOR_3DFACE));
There is more about drawing on the Graphics section of this site.
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