[gtkmm] Proper way to close and destroy a custom window

["Find All" <find_all hotmail com>]

I know this is a extremely 'newbie' question but :

What is the proper way to close (and destroy) a custom window?

I catch the signal_delete_event and all the user close conditions (for 
example a close button or from the indow menu) to call a function called 
mywindow_close(). What code do I have to put on mywindow_close() function?

I can't use Gtk::Main::quit becouse this will close the entire program and 
won't work on popup windows.

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