What you are experiencing as an issue is actually the way the control was meant to function. Scrolling to either side should reveal the content in this direction, rather than moving the control itself. The idea is to focus the scrolling on the content it presents, not the container. You can check the default behavior of the rotator with buttons by changing the RotatorType in our default rotator demo - http://demos.telerik.com/aspnet-ajax/rotator/examples/default/defaultcs.aspx
If you find this implementation incorrect, you can always swap the two buttons, thus swapping the scrolling directions. Doing so you will have the left button scroll the container to the left and the right - to the right side respectively.
Hope this helps.
the Telerik team
Register for the Q2 2011 What's New Webinar Week. Mark your calendar for the week starting July 18th and book your seat for a walk through of all the exciting stuff we will ship with the new release!