Need one more point to cleanup at Exercise 4

[runceel]

At end of Exercise 4, there is one more method that must be removed at AddNewExpense.xaml.cs. It is ChildChanged event handler that was added at Exercise 3.

        private void CalendarUwp_ChildChanged(object sender, System.EventArgs e)
        {
            WindowsXamlHost windowsXamlHost = (WindowsXamlHost)sender;

            Windows.UI.Xaml.Controls.CalendarView calendarView =
                (Windows.UI.Xaml.Controls.CalendarView)windowsXamlHost.Child;

            if (calendarView != null)
            {
                calendarView.SelectedDatesChanged += (obj, args) =>
                {
                    if (args.AddedDates.Count > 0)
                    {
                        Messenger.Default.Send<SelectedDateMessage>(new SelectedDateMessage(args.AddedDates[0].DateTime));
                    }
                };
            }
        }

[qmatteoq]

Fixed in 4dbc6cc