title: jquery multiselect filter cannnot be selected inside dialog with modal: true
body: <p>I'm using the the following jquery libraries:</p>
  
  <ul>
  <li>jQuery v1.10.1</li>
  <li>jQuery UI v1.10.3</li>
  <li><a href="http://www.erichynds.com/blog/jquery-ui-multiselect-widget" rel="noreferrer">jquery multiselect 1.13</a></li>
  <li>filter addon</li>
  </ul>
  
  <p>When i use the multiselect filter on any select, it works just find.
  When i use the multiselect filter inside the Dialog UI with property <code>modal:true</code> i cannot longer select to filter out the list - the placeholder of search, cannot be chosen.</p>
  
  <p>Without the property <code>modal:true</code>, it works just fine.</p>
  
  <p>I've tried to add the propery <code>appendTo: 'form'</code>, but still having issues.</p>
  
  <p>Edit: sample code
  <a href="http://jsfiddle.net/dQzxJ/3/" rel="noreferrer">http://jsfiddle.net/dQzxJ/3/</a></p>
  
  <p>Any ideas?
  Thanks,
  Eddie</p>