    goog.events.EventType.CLICK,
        function(e) {
          vc.getChild('Porthos').setVisible(e.target.checked);
        });
    goog.events.listen(goog.dom.getElement('enable_porthos'),
        goog.events.EventType.CLICK,
        function(e) {
          vc.getChild('Porthos').setEnabled(e.target.checked);
        });
    goog.events.listen(goog.dom.getElement('enable_vc_events'),
        goog.events.EventType.CLICK,
        function(e) {
          vc.forEachChild(function(c) {
            if (e.targe