UIElement.PredictFocus Method (FocusNavigationDirection)
When overridden in a derived class, returns the element that would receive focus for a specified focus traversal direction, without actually moving focus to that element.
Assembly: PresentationCore (in PresentationCore.dll)
The direction of the requested focus traversal.
The default implementation of this method in this class is incomplete, and always returns null.
Available since 3.0