Bind Telerik MVC TreeView to XElement

In order to bind Telerik MVC TreeView to an XElement, you need to define a recursive function, not a helper. For example,

@using Telerik.Web.Mvc.UI.Fluent;
@using System.Xml.Linq;
@model XElement

@functions {
 void BindXElement(TreeViewItemFactory item, XElement elem){
  var node = item.Add().Text(elem.Name.LocalName);
  foreach (var e in elem.Elements()) {
   node.Items(subItem => BindXElement(subItem, e));
  }
 }
}

@(Html.Telerik().TreeView()
  .Name("TreeView")
  .Items(item => BindXElement(item, Model))
)