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

        private static IEnumerable<PopupPlacement> GetPlacementModesInOrderOfPreference(PopupPlacement preferredPlacementMode)
        {
            yield return preferredPlacementMode;

            switch (preferredPlacementMode)
            {
                case PopupPlacement.Top:
                    yield return PopupPlacement.Bottom;
                    yield return PopupPlacement.Left;
                    yield return PopupPlacement.Right;
                    yield break;
                case PopupPlacement.Bottom:
                    yield return PopupPlacement.Top;
                    yield return PopupPlacement.Left;
                    yield return PopupPlacement.Right;
                    yield break;
                case PopupPlacement.Left:
                    yield return PopupPlacement.Right;
                    yield return PopupPlacement.Top;
                    yield return PopupPlacement.Bottom;
                    yield break;
                case PopupPlacement.Right:
                    yield return PopupPlacement.Left;
                    yield return PopupPlacement.Top;
                    yield return PopupPlacement.Bottom;
                    yield break;
            }
        }