title: can't set width for auxheader in zk
body: <p>I have a grid in which I want to set the width for auxheader in .zul but it's not working. I am using zk framework. </p>
  
  <pre><code>&lt;grid id="chartGrid" model="@bind(vm.chartGridModel)" mold="paging" 
        style="overflow:auto" width="100%"  &gt;
      &lt;auxhead hflex="2" &gt;
          &lt;auxheader hflex="2" align="center" width="200px" label="Date" rowspan="3"/&gt;
      &lt;/auxhead&gt;
      &lt;auxhead hflex="1"  children="@bind(vm.legendsFB)" visible="@bind(vm.vFb)" &gt;
          &lt;auxheader align="center" width="200px" colspan="1"&gt;&lt;/auxheader&gt;
            &lt;template name="children"&gt;
                  &lt;auxheader align="center" label="@bind(each)" colspan="@bind(
                       vm.viewType eq '0' ? 3 :2)" hflex="2"/&gt;
              &lt;/template&gt;
      &lt;/auxhead&gt;
  
      &lt;columns visible="false"&gt;&lt;!-- make it invisible --&gt;
      &lt;column width="200px"/&gt;&lt;!-- specify width here --&gt;
      &lt;column width="150px"/&gt;
      &lt;column width="50px"/&gt;
      &lt;column width="50px"/&gt;
      &lt;/columns&gt;
  &lt;template name="model"&gt;
      &lt;row&gt;
            &lt;cell align="center" &gt;&lt;label  value="@load(each.report_date)"&gt;&lt;/label&gt;
            &lt;/cell&gt;
            &lt;cell align="center"&gt;&lt;label value="@load(each.total_action)"&gt;&lt;/label&gt;
            &lt;/cell&gt;    
            &lt;cell align="center"&gt;&lt;label value="@load(each.from_user_male)"&gt;&lt;/label&gt;
            &lt;/cell&gt;    
            &lt;cell align="center"&gt;&lt;label value="@load(each.from_user_female)"&gt;&lt;/label&gt;
            &lt;/cell&gt;    
      &lt;/row&gt;
  &lt;/template&gt;
  &lt;/grid&gt;
  </code></pre>