<zk>
<menubar>
    <menu label="Project" onClick='lbl.setValue("Menu clicked")'>
        <menupopup>
            <menuitem label="New" onClick="lbl.setValue(self.label)" />
            <menuitem label="Open" onClick="lbl.setValue(self.label)" />
            <menuitem label="Save" onClick="lbl.setValue(self.label)" />
            <menuseparator />
            <menuitem label="Exit" onClick="lbl.setValue(self.label)" />
                        <menu label="Second Level" onClick='lbl.setValue("I dont work")'>
                              <menupopup>
                              <menuitem label="I do" onClick='lbl.setValue("I do")'/>
                              </menupopup>  
                        </menu>  
        </menupopup>

    </menu>
</menubar>
<label id="lbl" />
</zk>