le</code> is the string or function to be set as title. Use empty string to hide the title completely.
        Parameter <code>id</code> is the id of the custom time bar, and is <code>undefined</code> by default.
      </td>
    </tr>

    <tr>
      <td>setData({<br>&nbsp;&nbsp;groups: groups,<br>&nbsp;&nbsp;items: items<br>})</td>
      <td>none</td>
      <td>Set both groups and items at once. Both properties are optional. This is a convenience method for individually calling both <code>setItems(items)</