Hello, Nafise, 

Thank you for writing.  

I have logged it in our feedback portal. You can track its progress, subscribe for status changes and add your comments on the following link - feedback item.

I have also updated your Telerik points.

Currently, the possible solution that I can suggest is to handle the ItemsChanged event and add a new record to the DataSource manually.

I hope this information helps. Should you have further questions I would be glad to help.

Regards,
Dess
Progress Telerik

Hello, Nafise, 

I am following up to notify the item has been declined. The sample project was incorrectly set. I am attaching the project here as well. Whenever you copy/paste an item, the DataSource is updated with the new record.

I hope this information helps. Should you have further questions I would be glad to help.

Regards,
Dess
Progress Telerik

Thanks, It was useful.