Test it at the url below.
How can I batch save?
The issue in question is a know regression in the Spreadsheet widget. The bug has been already fixed and the fix will be available within our very next service pack, which is due later this month.
Love the Telerik and Kendo UI products and believe more people should try them? Invite a fellow developer to become a Progress customer and each of you can get a $50 Amazon gift voucher.