Default {@link #getZclass}: z-bandbox.(since 3.5.0)
Events: onOpen
Developers can listen to the onOpen event and initializes it when {@link org.zkoss.zk.ui.event.OpenEvent#isOpen} is true, and/or clean up iffalse.
Note: to have better performance, onOpen is sent only if a non-deferrable event listener is registered (see {@link org.zkoss.zk.ui.event.Deferrable}). @author tomyeh @since 3.5.2
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