title: Disable Zend Form Element validation if hidden
body: <p>I have a few elements in my zend form that are sometime hidden via javascript.</p>
  
  <p>I would like to disable their validations if they are hidden, so the form will be valid.</p>
  
  <p>Any way to do it in the server side? or in the element settings?</p>
  
  <p>Thanks.</p>