title: autocomplete ._renderItem and adding a Class to wrapper
body: <p>Going off the example here <a href="http://jqueryui.com/demos/autocomplete/#custom-data">http://jqueryui.com/demos/autocomplete/#custom-data</a>
  I'm wondering how to add a style to the <code>ul</code> wrapper when using <code>_renderItem()</code>:</p>
  
  <pre><code>    .data( "autocomplete" )._renderItem = function( ul, item ) {
          return $( "&lt;li&gt;&lt;/li&gt;" )
              .data( "item.autocomplete", item )
              .append( "&lt;a&gt;" + item.label + "&lt;br&gt;" + item.desc + "&lt;/a&gt;" )
              .appendTo( ul );
      };
  </code></pre>