<zk>
<listbox>
	<!--<custom-attributes org.zkoss.zul.css.flex="false"/>-->
	<listhead sizable="true">
		<listheader label="Col 1" hflex="1"/>
		<listheader label="Col 2" hflex="2"/>
		<listheader label="Col 3" hflex="2" visible="false" />
		<listheader label="Col 4" hflex="1"/>
		<listheader label="Col 5" hflex="1"/>
		<listheader label="Col 6" hflex="1"/>
	</listhead>
	<listitem>
		<listcell label="cell" />
		<listcell label="cell" />
		<listcell label="cell" />
		<listcell label="cell" />
		<listcell label="cell" />
		<listcell label="cell" />
	</listitem>
</listbox>
</zk>

<custom-attributes org.zkoss.zul.css.flex="false"/>