protected void Authentication_Completed(object sender, AuthenticatorCompletedEventArgs e)
        {
            authenticator_page.Authentication_Completed(sender, e);

            this.DismissViewController
            (
                true,
                async delegate
            {
                return;
            }
            );

            return;
        }
        protected void Authentication_Completed(object sender, AuthenticatorCompletedEventArgs e)
        {
            authenticator_page.Authentication_Completed(sender, e);

            return;
        }