java - ZK: How to intercept/use an event from a parent menubar?

I just started to learn ZK, and I'm having a seriuos problem to intercept an event (onClick) from a parent menubar that contain several menu and menuitem.

zk/Menubar.java at master · zkoss/zk · GitHub

ZK 6.0.0 Style Guide | Cascading Style Sheets | Html Element

ZK: Menubar with Buttons - design

ZK - ZK Component Reference/Essential Components/Menu/Menubar...

A container usually contains more than one menu elements. <menubar id="menubar"> <menu label="File"> <menupopup onOpen="alert(self.id)"> <menuitem label="New" onClick="alert(self.label)" /> <menuitem label="Open" onClick="alert(self.label)...

RuAdList and EasyList

... ###MT_overroll ~ div[class][style="left:0px;top:0px;height:480px;width:650px;"] ... .ru|gidporno.com|guide-box.ru|huyandex.com|i-pic.ru|imgmoney.ru|kino-zal.kz| kinohost. ... shpargalkablog.ru###adsenseNiz academ.info###adslinks z200.fm, zk.fm ... bash.im###menubar > div[style^="float:"] freakenergy.ru###menuforum ...

ZK 7.0.0 Style Customization Guide | Cascading Style Sheets

Menu bar - Wikipedia

A menu bar is a graphical control element which contains drop-down menus. The menu bar's purpose is to supply a common housing for window- or application-specific menus which provide access to such functions as opening files, interacting with an application, or displaying help documentation or manuals.

uStyle styleguide

Menubar (zk 7.0.3 API)