Hello Amruta Belurkar,
The Docking control doesn't use the DragAndDrop manager for its Drag and Drop feature. If you need to handle the drag and drop events of the Docking control - this is not supported. We are planning to enable these soon.
If you need to do something else, please give us some more information about your scenario.
P.S: You can find the same answer in your other thread as well.
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