signal for closing app

[Krzysztof <kj limes com pl>]

I'm the very beginner in GTKmm.
I design a simple interface in Glade. The application itself is written 
in C++.

Which signal should I choose and which handler should I specify in 
File-Quit menu item to have the same action as clicking the X at upper 
right corner of window?
How should I make it working in my application?

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Regards
Krzysztof J.