It seems that this is a different problem. Unfortunately we could not reproduce it.
Can you, please, send us the master page file so that we can test with it.
Providing a video recording of the steps undertaken will be of even greater help.
Thanks in advance for your cooperation!
As to the problem outlined below (ID 102347). It is in our list of planned improvements and will make it in some of the next releases.
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