summary Boolean (default: true)

If set to true, the task has child tasks.

Example - create summary task

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