protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (_masterContainer != null)
                {
                    _masterContainer.Dispose();
                    _masterContainer = null;
                }

                if (_detailContainer != null)
                {
                    _detailContainer.Dispose();
                    _detailContainer = null;
                }

                if (Element != null)
                {
                    Element.Appearing    -= OnMasterDetailAppearing;
                    Element.Disappearing -= OnMasterDetailDisappearing;
                }
            }

            base.Dispose(disposing);
        }