Infinite Scrolling
By default, when the user scrolls to the last slideview item the navigation button looks disabled and it can not be clicked. This behavior can be changed through the IsInfiniteScrollingEnabled property. When IsInfiniteScrollingEnabled property is enabled it allows infinite scrolling from last slideview item back to first item automatically and the same in vice versa.
Enable Infinite Scrolling
this.radSlideView1.IsInfiniteScrollingEnabled = true;
Me.radSlideView1.IsInfiniteScrollingEnabled = True