} else if (e.getPreviousValue() == null) { fireModification();
      public void propertyValueChanged(PropertyEvent e) {	if (e == null || e.getProperty() == null)	  return;	if (e.getProperty().getValue() == null) {	  if (e.getPreviousValue() == null)	    return;	  else	    fireModification();	} else if (! e.getProperty().getValue().toString().trim().equals(e.getPreviousValue().toString()))	  fireModification();      }