I am afraid that this functionality is not supported out of the box by the ScrollView widget. By design the user is supposed to navigate between the pages by swiping with finger. This is more sensibly when the application is opened on a mobile device.
If you insist to provide an opportunity for navigation via buttons, as a possible workaround I suggest you to put the previous/next buttons inside the View's header.
For your convenience I prepared a small example: http://jsbin.com/oyijoq/2/edit
the Telerik team
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