I'm afraid this requirement is not supported. RadPivotGrid is a control designed specifically for data-summary preview. It is not suitable for per individual record display, but rather for calculating and demonstrating a summarized, min, max, etc. value for a group of records. In this sense, the string names of the groups are available only in the row and column headers.
You may check the RadGrid control to see whether it is applicable in your scenario:
Please feel free to turn to us if new questions arise.
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.