You'll notice on the RadTreeView main page for Telerik UI for ASP.NET AJAX that the TreeView example has no dotted lines.
There are no lines connecting the nodes to their parents. However, on all of the "Functionality" pages (on the lefthand navigation), every single one of the examples contains lines.
How do I get rid of those dotted lines?
All you need to do to hide the dotted lines is to set the ShowLineImages property to false. You can see the following help article: http://www.telerik.com/help/aspnet-ajax/treeview-appearance-line-images.html.
Best regards, Rumen