Simple example :

public static void main (String args[]) {
       ControlPanel cp = TopManager.getDefault().getControlPanel();
      SystemOption sos[] = cp.getSystemOptions();
      int i = 0;
      for ( i=0; i < sos.length ; i++ ) {
        if (sos[i].getName().equals ("HTTP Server") ){
           HttpServerSettings hs = (HttpServerSettings) sos[i];
           hs.setRunning (false);
          break;
        }
      }
  }
}
preperty is not changed in property sheet and server was not runned.
In setRunning method is property changed by


firePropertyChange("running", new Boolean(!running), new Boolean(running));