orderId String|Number|Object (default: 0)

The position of the task relative to its sibling tasks.

Example - set the orderId of a task

<script>
var task = new kendo.data.GanttTask({
    id: 1,
    title: "Task1",
    orderId: 0,
    start: new Date("2014/6/17 9:00"),
    end: new Date("2014/6/17 11:00")
});
</script>