@Override
 public void notifyChanged(Notification notification) {
   int featureID = notification.getFeatureID(Edge.class);
   if (featureID == ActivitiesPackage.ACTIVITY_CALL_NODE__CALLED_ACTIVITY
       || featureID == ActivitiesPackage.ACTIVITY_CALL_NODE__NAME) {
     refreshVisuals();
   } else if (featureID == ActivitiesPackage.ACTIVITY_CALL_NODE__CALLEE) {
     refreshVisuals();
   } else {
     super.notifyChanged(notification);
   }
 }