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I have a custom static control as part of a toolbar. This custom static control needs to be repainted when some options are changed. However when it (based on CStatic) Invalidate() s itself, its OnPaint never gets called. I tried trapping the OnPaint message in the owner (toolbar), but there is a comment not to call CExtToolControlBar::OnPaint and several other buttons don’t display properly.

Is there a proper way to get the custom control to repaint properly?

If your static control is HWND-based, then you should simply redraw this window:

HWND hWnd = . . .
    ::InvalidateRect( hWnd, NULL, TRUE );
    ::UpdateWindow( hWnd ); // update the screen immediately

If it is a custom toolbar button, then just invoke the CExtBarButton::RedrawButton() method instead.