Dynamic Treeview using XML

I've been dealing quite a lot with WPF, but here is an interesting solution for ASP.Net.

I wanted a dynamic TreeView control to act as my navigation for a Web Application. The whole idea was to expose the links/items to a user only if she had permissions to view the page. Permissions are set via an other custom Web Application. Basically, each page has a PermissionId and each User is bound to a Role that has (or not) permission to a page.