Hello Jon,
Unfortunately there is no such client method and the control.
In such case I would recommend you to go through all the items and return the one that is checked. Here is a sample code that worked at my side:
Regards,
Plamen
Telerik
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?
Explore the
Telerik Feedback Portal
and vote to affect the priority of the items