title: Validating a group of elements in RichFaces 3.3.x / JSF
body: <p>I have a requirement where I have three &lt;rich:listShuttle&gt; elements from which <strong>at least one</strong> item must be selected <strong>between the three items</strong>, i.e. two &lt;rich:listShuttle&gt; elements could be empty as long as there is an element selected in the other.</p>
  
  <p>I am using <strong>RichFaces 3.3.2</strong> and am not currently able to upgrade to 4.</p>
  
  <p>I have tried using a validator on a hidden field which validates the state of the &lt;rich:listShuttle&gt; (I have them bound in a backing bean). However, the backing UIListShuttle is not updated before validation takes place.</p>
  
  <p>Thanks in advance.</p>