Thank you for writing.
I am glad to hear that you have found solution for your issue. We will introduce a new event in future release - NodeRemoving
, but it has not been implemented yet. Please feel free to visit the page in our Public Issue Tracking System and add your vote: http://www.telerik.com/support/pits.aspx#/details/Issue=10268
Please let us know if you need any further assistance.