public override void OnActivated(string arguments, NotificationUserInput userInput, string appUserModelId)
 {
     // Register COM server and activator type
     DesktopNotificationManagerCompat.RegisterActivator <CustomNotificationActivator>();
 }
 /// <summary>
 /// This method will be called when the user clicks on a foreground or background activation on a toast. Parent app must implement this method.
 /// </summary>
 /// <param name="arguments">The arguments from the original notification. This is either the launch argument if the user clicked the body of your toast, or the arguments from a button on your toast.</param>
 /// <param name="userInput">Text and selection values that the user entered in your toast.</param>
 /// <param name="appUserModelId">Your AUMID.</param>
 public abstract void OnActivated(string arguments, NotificationUserInput userInput, string appUserModelId);