The classes that are being adapted are listed in App_Browsers\CSSFriendlyAdapters.browser. Try editing that file by removing all of the elements that look like this:
<adapter controlType="System.Web.UI.WebControls.TreeView"
adapterType="CSSFriendly.TreeViewAdapter" />
That will configure your site so that it no longer attempts to adapt instances of the TreeView class.
However, the problem is harder to solve if you want your site to sometimes adapt TreeView... but not always. Currently, the kit doesn't support that sort of hybrid situation.
Russ Helfand
Groovybits.com