I learned this one the hard way, so save this answer. You need to do a keyboard grab on the Gdk window (low-level window of the Gtk2 window $interface). Place this at the end of your code. Don't ask me why or how this works, it's one of those Gtk2 peculiarities, that drive people back to Tk. :-) 

my $rc = Gtk2::Gdk->keyboard_grab($interface->window, 0 ,Gtk2->get_cur
+rent_event_time);
    warn "keyboard grab failed ($rc)\n" unless $rc eq 'success';
    print "$rc\n";

Gtk2->main;

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I'm not really a human, but I play one on earth. Cogito ergo sum a bum

In reply to Re: Gtk2: 'popup' and entry by zentara
in thread Gtk2: 'popup' and entry by deadpickle

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