Error in <RootX11ErrorHandler>: BadWindow

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Hi,

when I return in my program from the root event loop, I'd like to close
the TGMainFrame window. But either it doesn't close or, using
CloseWindow(), I get on the next pass

Error in <RootX11ErrorHandler>: BadWindow (invalid Window parameter) (XID:
79691955)
Error in <RootX11ErrorHandler>: BadWindow (invalid Window parameter) (XID:
79691906)

A code fragment inside the loop looks like this:

    RootWindow *rootwin = new RootWindow(gClient->GetRoot(), 450, 450);
// derived from TGMainFrame
    rootApp->Run(kTRUE);
    rootwin->CloseWindow();  // closes the window, but gives warning on
next pass
    delete rootwin;   // doesn't close the window

Thanks, Ulrich

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