ClearSelection

<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")
    }
  ]
});
var gantt = $("#gantt").data("kendoGantt");
// select the first task
gantt.select("tr:eq(0)");
gantt.clearSelection();
</script>