Public Overridable Function MoveFocus ( _
    request As TraversalRequest _
) As Boolean

Dim instance As UIElement
Dim request As TraversalRequest
Dim returnValue As Boolean

returnValue = instance.MoveFocus(request)

public virtual bool MoveFocus(
    TraversalRequest request
)

public:
virtual bool MoveFocus(
    TraversalRequest^ request
)

public function MoveFocus(
    request : TraversalRequest
) : boolean

You cannot use methods in XAML.