I have a TimerProc which calls MessageBox. I want the MessageBox to stay on top of other windows. So for example, the parent window sets the timer, then I move another window on top of that. When the timer fires, I want to MessageBox to appear on top of the window that is covering the app. Is this possible, and how should I go about doing it?
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I think you want to make it System Modal as MB_SYSTEMMODAL as described here.
And/or make the window that is on top be the owner of the MessageBox.