columns.expandable Boolean (default: false)

If set to true, the column will show the icons that are used for expanding and collapsing child rows. By default, the "title" column of the Gantt is expandable.

Example - making the second column expandable

<div id="gantt"></div>
<script>
$("#gantt").kendoGantt({
  dataSource: [
    {
      id: 1,
      orderId: 0,
      parentId: null,
      title: "Task1",
      start: new Date("2014/6/17 9:00"),
      end: new Date("2014/6/17 11:00")
    },
    {
      id: 2,
      orderId: 1,
      parentId: null,
      title: "Task2",
      start: new Date("2014/6/17 12:00"),
      end: new Date("2014/6/17 14:00")
    }
  ],
  dependencies: [
    {
      predecessorId: 1,
      successorId: 2,
      type: 1
    }
  ],
  columns: [{
    field: "id",
    expandable: true
  }, "title" , "start", "end"]
});
</script>