RTRamya Thirugnanam Syncfusion Team March 4, 2019 02:22 AM
Thanks for contacting Syncfusion support.
Please use collectionChange event instead of drop event If your requirement is to modify the node after dropped from symbol palette to diagram. The node gets added to diagram with args.state as changed and we can modify the node.
For more information about collectionChange event please refer to below help documentation link