can't signal_connect in windows.

[Dirk Koopman <djk tobit co uk>]

Take this snippet of code.

        use Gtk2 '-init';

        $main = new Gtk2::Window('toplevel');
        $main->signal_connect('delete_event', sub { Gtk2->main_quit; });
        $main->show_all;
        Gtk2->main;
        

I get: Can't locate object method "signal_connect" via package 
"Gtk2::Window".

So Gtk2 has initialised, $main is a ref to Gtk2::Window, what have I 
missed out (apart from the other 600 lines of code)?