zk messagebox

Messagebox.show("Are you sure to save?", "Confirm Dialog", Messagebox.OK | Messagebox.IGNORE  | Messagebox.CANCEL, Messagebox.QUESTION, new org.zkoss.zk.ui.event.EventListener() {
    public void onEvent(Event evt) throws InterruptedException {
        if (evt.getName().equals("onOK")) {
            alert("Data Saved !");
        } else if (evt.getName().equals("onIgnore")) {
            Messagebox.show("Ignore Save", "Warning", Messagebox.OK, Messagebox.EXCLAMATION);
        } else {
            alert("Save Canceled !");
        }
    }
});