private void EditClick(Object sender, RoutedEventArgs e)
        {
            if (ListView.SelectedItems.Count != 1)
            {
                return;
            }
            Meal meal = (Meal)ListView.SelectedItems[0];

            MainWindow.MainWindowAccessor.ChangeContentWindow(new AddEditMealView(meal));
        }
        private void DeleteClick(Object sender, RoutedEventArgs e)
        {
            if (ListView.SelectedItems.Count <= 0)
            {
                return;
            }
            List <Meal> meals = new List <Meal>(ListView.SelectedItems.Cast <Meal>());

            foreach (Meal meal in meals)
            {
                Meal.DeleteMealInDatabase(meal);
                ViewModel.Meals.Remove(meal);
            }
        }