title: Load page in a tab with ZK
body: <p>I have this code in ZK, with a menu to navigate:</p>
  
  <pre><code>&lt;zk apply="org.zkoss.bind.BindComposer"
      viewModel="@id('vm') @init('menu')"&gt;
      &lt;tabbox width="100%" sclass="nav_tabs"&gt;
          &lt;tabs id="tabs"&gt;
              &lt;tab label="Admin" onSelect="updateCategory(self.label)"/&gt;
              &lt;tab label="User" onSelect="updateCategory(self.label)"/&gt;
          &lt;/tabs&gt;
          &lt;tabpanels&gt;
              &lt;tabpanel&gt;
                  &lt;toolbar hflex="true"&gt;
                      &lt;toolbarbutton label="CreateUser" onClick="@Command('load',label=self.label)" /&gt;
                      &lt;toolbarbutton label="CreateMno" onClick="@Command('load',label=self.label)" /&gt;
                  &lt;/toolbar&gt;
              &lt;/tabpanel&gt;
              &lt;tabpanel&gt;
                  &lt;toolbar hflex="true"&gt;
                      &lt;toolbarbutton label="LoadData" onClick="@Command('load',label=self.label)" /&gt;
                      &lt;toolbarbutton label="DownloadData" onClick="@Command('load',label=self.label)" /&gt;
                  &lt;/toolbar&gt;
              &lt;/tabpanel&gt;
          &lt;/tabpanels&gt;
      &lt;/tabbox&gt;
      &lt;separator height="30px"&gt;&lt;/separator&gt;
      &lt;zscript&gt;&lt;![CDATA[
      void updateCategory(String category) {
          current_category.setValue(category);
          current_subpage.setValue("Index");
      }
  ]]&gt;&lt;/zscript&gt;
      &lt;hlayout&gt;
          &lt;label id="current_category" sclass="nav_text nav_category" onClick="@command('submit')"&gt;Our Product&lt;/label&gt;
          &lt;label sclass="nav_text"&gt;-&lt;/label&gt;
          &lt;label id="current_subpage" sclass="nav_text"&gt;Index&lt;/label&gt;
      &lt;/hlayout&gt;
  
  &lt;/zk&gt;
  </code></pre>
  
  <p>Then i have two roles Admin, and User, and i need load the pages of each user, and i am trying that when a user click in the toolbarbutton, for example CreateUser, then call a method that load in the space of my toolbar button the page, but i do not how can i do it.</p>
  
  <p>Something like:</p>
  
  <p><a href="http://www.zkoss.org/zkdemo/tabbox/navigation_tabs" rel="nofollow">http://www.zkoss.org/zkdemo/tabbox/navigation_tabs</a></p>
  
  <p>but i not need a string in Our product -> Product 1 - > Our Product-Product 1, i need load a page, and i am calling the page with the same name to the label.</p>
  
  <p>And a page from a java class</p>
  
  <p>Somebody can help me?</p>