Boogaart.Silverlight.Behaviors.Popup.OnPlacementTargetChanged C# (CSharp) Method

        private static void OnPlacementTargetChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
        {
            var popup = dependencyObject as Windows.Popup;
            Debug.Assert(popup != null);

            InvalidatePosition(popup);
        }