Such a functionality is currently not available in RadPivotGrid. I have added this to our feedback portal
. If interested, feel free to add your vote for it and subscribe for status changes on the following link: http://feedback.telerik.com/Project/154/Feedback/Details/156162
. In addition you can vote for existing requests, to help us in getting an accurate measurement of the demand for the various requests.
I hope that you find this information useful.