Supported event: onOpen.
Note: to have better performance, onOpen is sent only if non-deferrable event listener is registered (see {@link org.zkoss.zk.ui.event.Deferrable}).
To load the content dynamically, you can listen to the onOpen event, and then create menuitem when {@link org.zkoss.zk.ui.event.OpenEvent#isOpen}is true.
Default {@link #getZclass}: z-menu-popup. (since 3.5.0) @author tomyeh
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