Thank you for contacting us.
Currently RadTabStrip does not support arrow reverse when strip orientation is vertical - e.g. for Left and Right alignment arrow keys that navigate through items should be Up and Down instead of Left and Right. We are currently working on RadTabView, which will be an extended successor of RadTabStrip, where this keyboard navigation will be implemented in the proper way. This new control is expected to be publicly available in our next major release - Q2 2010 - expected somewhere in the middle of July.
I would like to thank you for your feedback - it is much appreciated. Do not hesitate to contact us if you have other questions.
the Telerik team
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