Hi Charles,
The frozen columns functionality is implemented by hiding the RadGrid "real" scrollbar (used with the scrolling with static headers) and using a "fake" one, which triggers some columns to be hidden and shown, depending on the scrollbar position. However, when you start tabbing through the textboxes, you are beggining to scroll the complete RadGrid data area, including the frozen columns. In other words, this is the same as scrolling the "real" hidden scrollbar. This is the cause tabbing and frozen scrolling to be not supported.
However, there is a workaround which works in a few scenarios. You should keep in mind that this is a custom code which is not universal and it will not work in all scenarios:
Regards,
Pavlina
Telerik
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