<?xml version="1.0" encoding="UTF-8"?><!--F30-1855653.zul{{IS_NOTE	Purpose:			Description:			History:		Mon Dec 24 16:05:59 TST 2007, Created by jumperchen}}IS_NOTECopyright (C) 2007 Potix Corporation. All Rights Reserved.{{IS_RIGHT}}IS_RIGHT--><zk xmlns:n="http://www.zkoss.org/2005/zk/native"><n:h2>[ 1855653 ]    Optimize Live Data with Listbox &amp; Grid</n:h2>	<n:ol>		<n:li>the showing and updating(scroll down) speed should be acceptable </n:li>	</n:ol><window title="Live Data Demo - Listbox" border="normal">	<zscript>		List items = new org.zkoss.zkdemo.userguide.BigList(1000);		ListModel strset = new ListModelList(items);		ListitemRenderer render = new ListitemRenderer() {		public void render(Listitem item, Object data) {			new Listcell("column1 - " + item.getIndex()).setParent(item);			new Listcell("column2 - " + item.getIndex()).setParent(item);			new Listcell("column3 - " + item.getIndex()).setParent(item);			new Listcell("column4 - " + item.getIndex()).setParent(item);		}		};	</zscript>	<listbox id="list" width="600px" rows="20" model="&#36;{strset}" itemRenderer="${render}">		<listhead sizable="true">			<listheader label="Load on Demend1" sort="auto"/>			<listheader label="Load on Demend2" sort="auto"/>			<listheader label="Load on Demend3" sort="auto"/>			<listheader label="Load on Demend4" sort="auto"/>		</listhead>	</listbox></window></zk>