title: ZK iterate through list of lists
body: <p>I'm totally new to the ZK framework and I'm not sure if the information I've provided would be enough or not. </p>
  
  <p>I'm aware that, if there is a fixed number of categories, then in the <code>.zul</code> file - for each <code>Groupbox</code>, a <code>Listbox</code> can be displayed.</p>
  
  <p>Currently, I have a list of users being displayed categorically i.e there is a dynamic number categories and each category has dynamic number of users. This is being implemented and displayed using <code>Vlayout</code>.</p>
  
  <p>There is a requirement where if there are more than 10 users in each category, then we should display 10 users and then provide a button (or something similar) to display more users in the same category.</p>
  
  <p>My questions are-</p>
  
  <ol>
  <li>Is it possible to achieve this requirement using <code>Vlayout</code>?</li>
  <li>If not, can we iterate through a list of <code>Groupbox</code>s to display <code>Listbox</code> (list of users) for
  each <code>Groupbox</code> (category) in the <code>.zul</code> file?</li>
  <li>Or is there a simpler / more efficient way of achieving this
  requirement?</li>
  </ol>
  
  <p>Any suggestions will be much appreciated.</p>