Hi ROOT'ers I'm working on a GUI for a DAQ, and I have some trouble with the window managers (X11) "Close" and/or "Delete" button. The question is, how do I know of the user has closed, say a canvas, or some TGMainFrame, by using the "Close" and/or "Delete" button. The point is that I need to make sure that I don't reference any window which isn't there! Thanks, Thomas
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