see https://www.telerik.com/account/support-tickets/view-ticket?threadid=1101276 for more details
The grid should allow grouping by multiple columns. The way it works now, is it groups by column 1, the by column 2 then by column 3. iN a lot of cases the desired output is not what's desired. See this link for more details see https://www.telerik.com/account/support-tickets/view-ticket?threadid=1101276