Applet can't communicate with zkoss 5.

<zk xmlns="http://www.zkoss.org/2005/zul"
	xmlns:h="http://www.w3.org/1999/xhtml"
	xmlns:zk="http://www.zkoss.org/2005/zk"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 
    
    <?script content="zk.useStackup = true;"?>
    <window id="test" width="100%" use="test.Test" apply="${testController}">

<script type="text/javascript">
                                            function notifyServer() {
                                                    var varUuid= $e("${wnd.uuid}").id;
                                                            zkau.send({uuid: varUuid,cmd:"onNotifyServer",data:null,ctl:true});
                                            }
                                            </script>
                                            <applet code="TestApplet" id="ticker" width="400px" style="border: 1px" mayscript="mayscript">
                                            </applet>

public class Test extends Window {

   static {
    addClientEvent(Test.class, "onNotifyServer", CE_IMPORTANT); //assume it is an important event
  }

    @Override
  public void service(org.zkoss.zk.au.AuRequest request, boolean everError) {
    String cmd = request.getCommand();
    if (cmd.equals("onNotifyServer")) {
      Map data = request.getData();
      int x = ((Integer)data.get("x")).intValue();
      int y = ((Integer)data.get("y")).intValue();
      //do whatever you want
    } else {
      super.service(request, everError);
    }
  }
}

public void actionPerformed(ActionEvent e) {
		JSObject jso = null;
		
		try {
			jso = JSObject.getWindow(this);
			jso.call("notifyServer", new Object[] {"manuel hinojosa jara"});
			System.out.println("notifyServer Fired!");
                        btnShowMessage.setText("START!");
		} catch(JSException ex) {
			System.out.println("Could not create JS Object. Javascript Disabled!");
                        btnShowMessage.setText("ERROR!");
		}

	}