'Declaration Public Overridable Function CalculateViewport( _ ByVal target As UIElement, _ ByVal xReference As FrameworkElement, _ ByVal yReference As FrameworkElement _ ) As Rect
public virtual Rect CalculateViewport( UIElement target, FrameworkElement xReference, FrameworkElement yReference )
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2