If you only need to add a button to your rows you should simply add a new unbound column as demonstrated here. The example demonstrates how you can add a Delete button to the rows but you can as easily add a button that execute some other action.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items