private void UserChanged(UserChangedEvent e) {
            if (e?.User == null) {
                loggedInPanel.Visibility = Visibility.Collapsed;
                loginPanel.Visibility = Visibility.Visible;
            } else {
                loggedInPanel.Visibility = Visibility.Visible;
                loginPanel.Visibility = Visibility.Collapsed;

                if (e?.User?.email == null) {
                    loggedInTextBlock.Text = "SignedIn".t(R.File.PROFILE);
                } else {
                    loggedInTextBlock.Text = String.Format("SignedInAs".t(R.File.PROFILE), e.User.email);
                }

            }
        }
 public void OnUserChanged(UserChangedEvent e) {
     GoBack();
 }