def connect_widget(self):
        """Perform the initial connection of the widget

        the default implementation will connect to the widgets signal
        based on self.signal_name
        """
        if self.signal_name is not None:
            # None for read only widgets
            sid = self.widget.connect(self.signal_name, self.widget_changed)
            self.connections.append(sid)
Perform the initial connection of the widget

        the default implementation will connect to the widgets signal
        based on self.signal_name