For example
<zk>
<listbox multiple="true" checkmark="true" mold="paging" pageSize="5">
<custom-attributes org.zkoss.zul.listbox.rod="true"/>
<listhead>
<listheader label="Name1"/>
<listheader label="Address"/>
</listhead>
<zk forEach="1,2,3,4,5,6,7,8,9">
<listitem>
<listcell label="Name ${each}"></listcell>
<listcell label="Address ${each}"></listcell>
</listitem>
</zk>
</listbox>
<listbox multiple="true" checkmark="true" mold="paging" pageSize="10">
<custom-attributes org.zkoss.zul.listbox.rod="true"/>
<listhead>
<listheader label="Name2"/>
<listheader label="Address2"/>
</listhead>
<zk forEach="1,2,3,4,5,6,7,8,9">
<listitem>
<listcell label="Name ${each}"></listcell>
<listcell label="Address ${each}"></listcell>
</listitem>
</zk>
</listbox>
</zk>

Expected: If select all is not supported with ROD then the select all should not be visible.
Actual: In 2nd listbox it is visible.