how to invoke redereritem

<?page title="Auto Generated index.zul"?>
<window title="Hello World!!" border="normal" width="100%" height="100%" apply="com.test.simple.WindowController">

<label value="You are using: ${desktop.webApp.version}"/>
<label value="Selected Item:" id="lblMsg"/>
<listbox mold="paging" autopaging="true" vflex="true" id="list" >
	<listhead>
		<listheader label="Itens" sort="auto" >
		</listheader>
	</listhead>
</listbox>
</window>

package com.test.simple;

import java.util.ArrayList;

import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.util.GenericForwardComposer;
import org.zkoss.zul.Label;
import org.zkoss.zul.ListModelList;
import org.zkoss.zul.Listbox;
import org.zkoss.zul.Listcell;
import org.zkoss.zul.Listitem;

public class WindowController extends GenericForwardComposer {
	private static final long serialVersionUID = 1344018793022195316L;
	private Listbox list;
	private Label lblMsg;

	@Override
	public void doAfterCompose(Component comp) throws Exception {
		// TODO Auto-generated method stub
		super.doAfterCompose(comp);
		ArrayList<String> simpleListItens = new ArrayList<String> ();
		for ( int nIndex = 0; nIndex < 100; nIndex ++)
		{
			simpleListItens.add( "Item No.: " + nIndex );
		}
		list.setModel( new ListModelList ( simpleListItens ));
	}
	
	
	public void onSelect$list ()
	{
		Listitem item = list.getSelectedItem();
		
		if ( item == null )
			return;
		//THIS IS WHAT REALLY MATTERS!!!!!! Each line of listbox has a list of listcells (one or more)
		Object obj = item.getChildren().get(0); // get the first cell.
		if ( obj != null )
		{
			Listcell cell = ( Listcell) obj;
			lblMsg.setValue( "Select Item: " + cell.getLabel() ); //get the label and show it!
		}
	}
	
}