private Uri GetDefaultSource()
        {
            AuthorizationContentLoader loader = this._frame.ContentLoader as AuthorizationContentLoader;

            if (loader != null)
            {
                return(loader.DefaultSource);
            }

            return(null);
        }
        private void SetDefaultSource(Uri source)
        {
            AuthorizationContentLoader loader = this._frame.ContentLoader as AuthorizationContentLoader;

            if (loader != null)
            {
                if (loader.DefaultSource == null)
                {
                    loader.DefaultSource = source;
                }
            }
        }