Problem with listbox header on IE

<jsp:include page="test.zul"></jsp:include>

<?taglib uri="http://www.zkoss.org/dsp/web/core" prefix="c" ?>

<?page title="title" contentType="text/html;charset=UTF-8"?>
<zk>
<window title="Users Table" border="normal" >
	<listbox id="gridUsersList" fixedLayout="true" mold="paging" pageSize="10"  multiple="true" checkmark="true">
		<listhead sizable="true">
			<listheader label="HEAD1" sort="auto" width="10%"/>
			<listheader label="HEAD2" sort="auto" width="10%"/>
			<listheader label="HEAD3" sort="auto" width="10%"/>
		</listhead>
		<listitem>
		  <listcell label="COL1"></listcell>
		  <listcell label="COL2"></listcell>
		  <listcell label="COL3"></listcell>
		</listitem>
	</listbox>
</window>
</zk>