Unfortunately, replacing the textblock with a checkbox is not possible at the present time. You can find this issue logged in our Public Issue Tracking System
, it is forwarded to our developers for further consideration.
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.