You can try configuring RadGridView.IsTabStop="False". That way you will only be able to tab over the TextBoxes assigned as CellTemplate.
Otherwise, the way to control the Tab stop behavior of the column would be through configuring column.TabStopMode
, however, this seems to be not useful in the specific case.
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 Feedback Portal
and vote to affect the priority of the items