Unfortunately current version of RadGridView control doesn't support such scenario. You could override TAB key behavior, like in the attached example (take a look at CustomKeyboardProvider class and its usage). This code will give you control over TAB key behavior.
P.S. We have plans to improve TAB navigation in such scenarios, but I cannot commit with any specific date or release.
All the best,
Nedyalko Nikolov
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?
Explore the
Telerik Public Issue Tracking
system and vote to affect the priority of the items.