Closing the TCanvas window

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Hi Rooters,

My applications program has two windows. The first one is a GUI window
(TGMainFrame) and the second one a graphic window (TCanvas). The GUI window
controls the graphic window. That means the user can define which graphs she/he
wants to see. But the user is also able to close the graphic window and after
this action the GUI window still want to change the graphics. Of course this
creates an error. 

Is there a function like TGMainFrame::CloseWindow() for the TCanvas class to
inform the application program that the user has closed the window?


Thanks for your help.
Reiner.

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