def __expandpreferences(self, params=None):
        """ Callback to expand the window for preferences. """
        # We have a race condition here. If GTK cant resize fast enough, then it gets very sluggish
        # See configure-event signal of gtk.Widget
        # start timer, resize, catch configure-notify, set up idle handler, when idle resize to what the size should be at this point of time, repeat
        if hasattr(self, 'expandtimeout'):
            self.windowsize = self.window.get_size()
            if self.windowsize[1] <= 300:
                self.window.resize(self.windowsize[0], self.windowsize[1]+30)
                while (self.window.configure_request_count == 0):
                    return True
            else:
                print "done, add stuff to the expanded window."
                self.button = gtk.Button("Hola")
                self.vbox.pack_start(self.button, False, False, 0)
                self.button.show()
            return False
        else:
            self.expandtimeout = gobject.timeout_add(30, self.__expandpreferences)