Backstage View is the Office 2010 replacement of the Application Menu. It is a menu that covers the whole window area and contains buttons and tabs.
Each tab have a content area, which can be populated with any type of Controls.
To enable the Backstage View in RadRibbonBar change the ApplicationMenuStyle property to BackstageView.
[C#] Enabling Backstage view
radRibbonBar1.ApplicationMenuStyle = Telerik.WinControls.UI.ApplicationMenuStyle.BackstageView;
[VB.NET] Enabling Backstage view
RadRibbonBar1.ApplicationMenuStyle = Telerik.WinControls.UI.ApplicationMenuStyle.BackstageView