The Gantt can be forced to do a full refresh by calling the read
method on its data sources:
var gantt = $("#gantt").getKendoGantt();
I'm not sure what do you mean by the row in the second question.
Dragging the tasks will trigger these events as in the demo
Reordering the tasks from the list on the left will not trigger these events.
This is by design and the model will updated as a result of the reordering.
I hope this helps.
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