When Frozen columns are added to Listbox which has its mode set to "paging", it causes problem.

Following is a simple zul page to re-produce the error

<zk>
<listbox mold="paging" pageSize="2" >

<listhead>
<listheader label="header 1"/>
<listheader label="header 2"/>
<listheader label="header 3"/>
<listheader label="header 4"/>
</listhead>
<frozen columns="2"/>
<listitem>
<listcell label="cell 1"/>
<listcell label="cell 2"/>
<listcell label="cell 3"/>
<listcell label="cell 4"/>
</listitem>
<listitem>
<listcell label="cell 1"/>
<listcell label="cell 2"/>
<listcell label="cell 3"/>
<listcell label="cell 4"/>
</listitem>
<listitem>
<listcell label="cell 1"/>
<listcell label="cell 2"/>
<listcell label="cell 3"/>
<listcell label="cell 4"/>
</listitem>
<listitem>
<listcell label="cell 1"/>
<listcell label="cell 2"/>
<listcell label="cell 3"/>
<listcell label="cell 4"/>
</listitem>
</listbox>
</zk>