he Timeline.
        <code>groups</code> can be an Array with Objects,
        a DataSet (offering 2 way data binding), or a DataView (offering 1 way data binding).
        For each of the groups, the items of the timeline are filtered on the
        property <code>group</code>, which must correspond with the id of the group.
      </td>
    </tr>

    <tr>
      <td>setItems(items)</td>
      <td>none</td>
      <td>Set a data set with items for the Timeline.
        <code>items</code> can be an Array with