That's right. Glade allows you to design the interface, and define the actions that correspond to certain events. This will result in an XML-file, which in turn can be used from within Perl-Gtk, so you can create Perl-methods with the names of the actions defined in Glade.

I saw an excellent presentation of this by Paolo Molaro (the author of this package) at YAPC::Europe in London

Jouke Visser, Perl 'Adept'