RadRibbonView
Telerik Silverlight RibbonView is an easy-to-use implementation of the Microsoft Office 2010 Aero “ribbon” UI, which allows you to better organize the navigation functionality of your application into a single and compact toolbar control. Its built-in tabs, menus and buttons, popup engine, dynamic resizing, powerful customization options and Office 2010 Application Menu (Backstage view), make the Silverlight RibbonView your shortcut to creating powerful navigation systems.