RadEditor does not support this feature - in this scenario, RadEditor works in the same way as the default editor. I will log this as a feature request for future consideration.
Your points were updated.
All the best,
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