In WPF the WindowsFormsHost control is displayed on top of the Backstage menu

Reason for declining: The WindowsFormsHost element is drawn on top of any Adorner elements. As the RadRibbonBackstage is an Adorner the WindowsFormsHost is drawn on top of it. As a workaround to this framework limitation  you could bind Visibility of the WindowsFormsHost  to the IsBackstageOpen property of the RadRibbonView and collapse/hide it when the backstage is open. You can find more information about the WindowsFormsHost and its features and limitation in this article ( http://msdn.microsoft.com/en-us/library/ms744952.aspx ).