Thank you for contacting us and for your kind words about the control.
Actually we have already implemented this feature in our working version and the feature will be publicly available with the upcoming Q3 2011 Service Pack 1 release. You will be able to set the RadSlideView.Orientation property to the preferred horizontal or vertical orientation.
I hope this information is useful. Do not hesitate to write us back should you have any other question/problem with our tools.
the Telerik team
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