roup will display all items having a
        property <code>group</code> which matches the <code>id</code>
        of the group.</td>
    </tr>
    <tr>
      <td>style</td>
      <td>String</td>
      <td>no</td>
      <td>
        A css text string to apply custom styling for an individual group label, for
        example <code>"color: red; background-color: pink;"</code>.
      </td>
    </tr>
    <tr>
      <td>subgroupOrder</td>
      <td>String or Function</td>
      <td>none</td>
      <td>Order the 