/// <summary>
 /// Handles the event for user tapping on the login button
 /// </summary>
 /// <param name="sender">
 /// Sender object
 /// </param>
 /// <param name="e">
 /// Event args
 /// </param>
 private void LoginButtonClick(object sender, RoutedEventArgs e)
 {
     SessionStorage.Remove();
     
     FacebookSessionClient fb = new FacebookSessionClient(AppId);
     fb.LoginWithApp("basic_info,publish_actions,read_stream", "custom_state_string");
 }