public override void ViewDidLoad ()
		{
			base.ViewDidLoad ();

			var doneButton = new UIBarButtonItem (UIBarButtonSystemItem.Done, (s,e) => {

			});
			NavigationItem.SetRightBarButtonItem (doneButton, false);

			View = editTripView = new EditTripScreenView (View.Frame, this.trip);

			editTripView.ButtonExpenses.TouchUpInside += (sender, e) => {
				if(tripInfoController ==null)
					tripInfoController = new TripInfoScreenController();
				this.NavigationController.PushViewController(tripInfoController, true);
			};

		}
        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            var doneButton = new UIBarButtonItem(UIBarButtonSystemItem.Done, (s, e) => {
            });

            NavigationItem.SetRightBarButtonItem(doneButton, false);

            View = editTripView = new EditTripScreenView(View.Frame, this.trip);

            editTripView.ButtonExpenses.TouchUpInside += (sender, e) => {
                if (tripInfoController == null)
                {
                    tripInfoController = new TripInfoScreenController();
                }
                this.NavigationController.PushViewController(tripInfoController, true);
            };
        }