internal static bool Within(this Point referencePoint, UIElement referenceElement, FrameworkElement targetElement, bool ignoreVertical)
{
Point position = referenceElement.Translate(targetElement, referencePoint);
return position.X > 0 && position.X < targetElement.ActualWidth
&& (ignoreVertical
|| (position.Y > 0 && position.Y < targetElement.ActualHeight)
);
}