ANAshok N Syncfusion Team June 4, 2015 03:07 PM UTC
Thank you for contacting Syncfuusion support.
We have analyzed your query and we are able to reproduce the reported application was hangs issue when we set SelectionMode as Multiple. We have modified the sample based on your requirement and attached sample in the below sample location, please refer it. From this sample you can able to drag and drop the multiple selected rows.