Tip: If you want to disable browser's default context menu, you can set the context attribute of a c

<?page id="loginw" title="Test"?>
<zk xmlns="http://www.zkoss.org/2005/zul"
xmlns:h="http://www.w3.org/1999/xhtml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.zkoss.org/2005/zul http://www.zkoss.org/2005/zul/zul.xsd" >

<window id = "login" context="editPopup" closable="false" position="center" border="normal" mode="embedded" height="100px" width="100px">

</window>

<menupopup id="editPopup">
	    <menuitem label="Undo"/>
	    <menuitem label="Redo"/>
 
	    <menu label="Sort">
	        <menupopup>
	            <menuitem label="Sort by Name" autocheck="true"/>
	            <menuitem label="Sort by Date" autocheck="true"/>
	        </menupopup>
	    </menu>
</menupopup>
 
<label value="Right Click Me!" context="editPopup"/>
	
</zk>

<zk>
	<menupopup id="editPopup">
	    <menuitem label="Undo"/>
	    <menuitem label="Redo"/>
 
	    <menu label="Sort">
	        <menupopup>
	            <menuitem label="Sort by Name" autocheck="true"/>
	            <menuitem label="Sort by Date" autocheck="true"/>
	        </menupopup>
	    </menu>
	</menupopup>
 	<popup  zclass="z-popup-plain" style="height:0;width:0;overflow:hidden" id="editPopup2"/>
	<label value="Right Click Me!" context="editPopup2"/>
	<separator bar="true"/>
	<label value="Right Click Me!" onRightClick="alert(self.value)"/>
</zk>