protected void fireChangeEvent(){
  Iterator iter=m_listeners.iterator();
  ChangeEvent evt=new ChangeEvent(this);
  while (iter.hasNext()) {
    ChangeListener cl=(ChangeListener)iter.next();
    cl.stateChanged(evt);
  }
}

protected void fireChangeEvent ( ) { Iterator iter = m_listeners . iterator ( ) ; ChangeEvent evt = new ChangeEvent ( this ) ; while ( iter . hasNext ( ) ) { ChangeListener cl = ( ChangeListener ) iter . next ( ) ; cl . stateChanged ( evt ) ; } }
fire a change event to listeners .
