ZK KeyStroke event with Windows Component in ZUL

ZK provide KeyStroke event we can see how can we add these KeyStroke event with windows in ZUL..

<?page title="new page title" contentType="text/html;charset=UTF-8"?>
<zk>
 <window title="new page title" border="normal" id="inp"
    ctrlKeys="^a^s^d#f8"  attribute name="onOK"><![CDATA[
                        Messagebox.show("ENTER key is pressed", "OK",
                                Messagebox.OK, Messagebox.EXCLAMATION);
                        self.focus();
                    ]]></attribute>
                    <attribute name="onCancel"><![CDATA[
                        Messagebox.show("ESC key is pressed", "CANCEL",
                                Messagebox.OK, Messagebox.EXCLAMATION);
                        self.focus();
                    ]]></attribute>
                    <attribute name="onCtrlKey"><![CDATA[
                        int keyCode = ((KeyEvent) event).getKeyCode();
                        System.out.println(keyCode);
                        String s = "";
                        switch(keyCode){
                            case 65: s = "Ctrl+A";break;
                            case 119: s = "F8";break;
                            case 83:s="Ctrl+S";break;
                            case 68:s="Ctrl+D";break;
                        }
                        Messagebox.show(s+" is pressed", "CtrlKey",
                                Messagebox.OK, Messagebox.EXCLAMATION);
                        inp.focus();
                    ]]></attribute>
   
  
  
 </window>
</zk>