@Override
  public void notifyChanged(Notification notification) {
    updateChildren(notification);

    switch (notification.getFeatureID(ScaWaveform.class)) {
      case ScaPackage.SCA_WAVEFORM__PORTS:
        fireNotifyChanged(new ViewerNotification(notification, this, true, false));
        return;
      default:
        break;
    }
    super.notifyChanged(notification);
  }