ateGroup</code> are set <code>true</code>.
      </td>
    </tr>
    
    <tr>
      <td>order</td>
      <td>function</td>
      <td>none</td>
      <td>
        <p>Provide a custom sort function to order the items. The order of the
          items is determining the way they are stacked. The function
          order is called with two arguments containing the data of two items to be
          compared.
        </p>
        <p style="font-style: italic">WARNING: Use with caution. Custom ordering is not sui