This is rather old post but here’s why this is happening in case someone else has a same problem. When you press a key on keyboard (and release it, thus actually making one “click” of that key) there are two events emitted. QEvent::KeyPress and then QEvent::KeyRelease. The first one closes the message box and object that gets the focus (after closing message box) also gets QEvent::KeyRelease called for it, which causes that object to “think” that key was pressed inside it. Filter out QEvent::KeyRelease event for object that can get focus after message box closes. Worked for me