Gets a value that indicates whether the UIElement has focus.
Assembly: PresentationCore (in PresentationCore.dll)
Subclasses can override this property to specify when the element has keyboard focus. This is useful when your UIElement contains elements that can have keyboard focus and you want your element to report that it has focus.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)