setVisible(false) of listitem is not work if the height of listbox is specified

<zk>
	<listbox height="100px">
		<listitem id="li">
			<listcell id="lc" label="list cell">
				<div id="div">div</div>
			</listcell>
		</listitem>
	</listbox>
	<button label="hide list item">
		<attribute name="onClick">
			li.setVisible(false);
		</attribute>
	</button>
	<button label="hide list cell">
		<attribute name="onClick">
			lc.setVisible(false);
		</attribute>
	</button>
	<button label="hide div">
		<attribute name="onClick">
			div.setVisible(false);
		</attribute>
	</button>
</zk>