How do I prevent the main window from being destroyed?

["Mauricio Silveira" <msilveira linuxbr com>]

I was wondering how do i get the main window not to be destroyed, but being hidden instead.

Like X-CD Roast, when you click the WM Decoration's "X" (close), it opens a transient window without destroying the main window.

How do I do that with Gtk1-perl?

 

It is working all right with a "Quit Button".

 

Thanks