Thank you for writing.
Is this for a Silverlight application? As I know ListBoxView or ComboBox controls support Data Virtualization of their visual items. Unfortunately this means that you have no access to the visual items that are not visible in the list. This is a Silverlight limitation. Silverlight only puts in the Visual Tree (which is what we access and rely on) those items that are needed to draw the UI. If you want to access item that is not visible you have to scroll to it.
I case that you have other related questions, fell free to write us.
the Telerik team
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