Hello Kevin Hendriks,
This functionality is not supported by the grid out-of-the-box. Still, you may edit its template and align the aggregates according to the corresponding columns. You may take a look at this forum thread for a reference and a sample project.
the Telerik team
Thank you for being the most amazing .NET community! Your unfailing support is what helps us charge forward!
We'd appreciate your vote for Telerik in this year's DevProConnections Awards. We are competing in mind-blowing 20 categories and every vote counts! VOTE for Telerik NOW >>