I see that you have downloads for RadControls for ASP.NET AJAX, so you can get sample skins from there. After you install the RadControls there is a folder Skins
. For your convenience I attached the RadTreeView skins for RadControls for ASP.NET AJAX Q2 2010 SP1 that are used inside Sitefinity 3.7 SP4.
All the best,
the Telerik team
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