erated and the label is the
    content as you define it in the groups. If you have datapoints that are not part of a group, a default group is created with the label: 'default'.
    In this example, the setting <code>defaultGroup</code> is used to rename the default group to 'ungrouped'.
</div>
<br />

<div id="visualization"></div>

<script type="text/javascript">
    // create a dataSet with groups
    var names = ['SquareShaded', 'Bargraph', 'Blank', 'CircleShaded'];
    var groups = new vis.DataSet();
