<window>
You should not see any exception after this page loaded.
 <zscript>
 org.zkoss.zul.ListModelList model = new org.zkoss.zul.ListModelList();
 model.add("A");
 model.add("B");
 model.add("C");
 model.add("D");
</zscript>
 <grid id="grid" width="300px" model="${model}">
  <template name="model">
   <row>
    <label value="${each}" />
   </row>
  </template>
 </grid>
</window>