addedProperty.addPropertyListener(myPropertyListener); fireModification();
  public void propertyAdded(PropertyEvent e) {    Property addedProperty = e.getProperty();    Property myProperty =       getProperty(addedProperty.getName().last().toString());    if (myProperty != null) {      setPropertyVisible(addedProperty, true);    }    addedProperty.addPropertyListener(myPropertyListener);    fireModification();  }