title: jQuery UI Sortable: dragged element disappears
body: <p>I set the <code>&lt;div class="container"&gt;</code> <code>.sortable()</code>, and there are some elements in the container.</p>
  
  <p>When I drag the inner element, intend to sort the element with the others, once the dragged one out the container, <strong>it can not be seen</strong>.</p>
  
  <p>But when I drop it into place holder, it could be seen again. <a href="http://jsfiddle.net/hh54188/UHYVH/">Online case is here</a>.</p>
  
  <p>Anyone have met the problem before? Or anyone can help me with the problem?</p>
  
  <p>Thank you</p>