<zk>
	<listbox multiple="true" checkmark="true" width="150px">
		<attribute name="onSelectAll">
			System.out.println(event.isSelectAll());
		</attribute>
		<listhead>
			<listheader label="col" />
		</listhead>
		<listitem forEach="1,2,3,4,5" label="Item"/>
	</listbox>
</zk>