public void removePropertyChangeListener(String propertyName,PropertyChangeListener listener){
  try {
    propertyChangeSupport.removePropertyChangeListener(propertyName,listener);
  }
 catch (  AssertionError e) {
  }
}

public void removePropertyChangeListener ( String propertyName , PropertyChangeListener listener ) { try { propertyChangeSupport . removePropertyChangeListener ( propertyName , listener ) ; } catch ( AssertionError e ) { } }
removes the property change listener .
