Yeah, I was annoyed that you can't grab the ClientID of the TreeNode object. Oh well. <a HREF="/1123142/ShowPost.aspx">There is a similar request posted today</a>. My suggestion: search by elements containing either the current URL or the SelectedNodeStyle-CssClass (which may be more exclusive, depending on your page structure). Of course, either of these may return a collection that requires further assessment if you aren't careful with defining the scope of your search.