FocusManager.GetFocusScope Method (DependencyObject)
Determines the closest ancestor of the specified element that has IsFocusScope set to true.
Assembly: PresentationCore (in PresentationCore.dll)
A focus scope is a container element that keeps track of the FocusManager.FocusedElement within its scope. By default, the Window class is a focus scope as are the Menu, ContextMenu, and ToolBar classes. An element which is a focus scope has IsFocusScope set to true.
For more information on focus, keyboard focus, and logical focus, see the Input Overview.
Available since 3.0