Cannot turn on the multiple selection of the listbox when use databinding 1

<?init class="org.zkoss.zkplus.databind.AnnotateDataBinderInit" ?>
<zk>
	<window >
	
	<zscript><![CDATA[
		List list = new ArrayList();
		
		for (int i = 0; i < 10; i++) {
			list.add("item " + i);
		}
		
		ListModelList model = new ListModelList(list);
		model.setMultiple(true);
	]]></zscript>
	<listbox width="150px"  model="@{model}" checkmark="true">
		<listhead>
			<listheader label="col"/>
		</listhead>
		<listitem self="@{each=item}" label="@{item}"/>
	</listbox>

	</window>
</zk>