Hi Scott Rozman,
Thank you for contacting Telerik Support.
Please do not disable the embedded style sheet unless you are going it to load it from an external location. Disabling this property will pretty much break the control if you do not provide an external base style sheet. If you create a .skin file in your site theme folder and use something like this:
<%@ Register TagPrefix="telerik" Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" %>
The tree view in the archive control will use the WebBlue embedded skin. Skinning this tree view is exactly the same procedure as the one described here: Controling appearance of RadControls for ASP.NET AJAX in Sitefinity
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