How to simulate full window (manager) close-button behaviour?

[Toralf Lund <toralf procaptura com>]

This is something I've wondered about for a long time. Or maybe I solved 
the problem once, but I can't find the code now:

Is there a simple way to tell Gtk to do exactly what it would do when if 
the user pressed the window (window manager) close button, when working 
with a Window widget?

I mean, usually gtk_widget_destroy() or gtk_widget_hide() will be called 
as part of the handling, but those functions are not what I'm looking 
for; I also want to execute the full event handler "chain" that may lead 
to these calls as well as other tests or whatever that are part of the 
full close behaviour.

Help, anyone?

- Toralf