void ShowPassKit()
        {
            Console.WriteLine("Show PassKit");
            var pkvc = new PassKitViewController();

            pkvc.Title = "Event Ticket";
            NavigationController.PushViewController(pkvc, true);
        }
 void ShowPassKit()
 {
     Console.WriteLine ("Show PassKit");
     var pkvc = new PassKitViewController();
     pkvc.Title = "Event Ticket";
     NavigationController.PushViewController (pkvc, true);
 }