application no response after window maxinum


I am working on a task writing a gtk application to show up webcam view finding.
This application works now.
But after I click window right top icon for maximum, the window is
maximum and no response.
I have read some threads from web said that the application need a
call back function to handle
 some signals. But I can't find out it now with googling.
I guess it's a very beginner level issue and you guys of list already
know that how to fix it.
I expect someone can give me help. Very appreciated.


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