I assume that you are referring to the items that are shown on the RadCarousel control. Unfortunately, at the moment there is no straightforward way of determining which item is at the top position. However, you could use the ZIndex attatched property to find the top element. You could loop through all children of a RadCarouselPanel and compare the ZIndex properties of all items using the static method Panel.GetZIndex(child) - the child with the largest z index will be one at the top. If you are using RadCarousel, rather than RadCarouselPanel, you should first get the RadCarouselPanel that the RadCarousel uses by using the RadCarousel.FindCarouselPanel() method, and then apply the ZIndex comparison.
We will be adding TopElement property to our carousel in a future release.
All the best,
the Telerik team
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