How to refresh DrawingArea ?

[Marcus_dev <marius juska yahoo com>]

Hello

I've done on C++ that I could draw oriented graph on the DrawingArea.
However I faced a problem that when a dialog window opens and I close it,
the drawing that was under the dialog window dissapears. 
What to do that I could see full drawing on DrawingArea after the window
above is closed ?
Are there any refresh functions or something like that?

Thank you, Marcus ;)
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