private void AddStaff(object sender, RoutedEventArgs e)
        {
            Hotel.NewStaff();
            CreateStaffAdmin CSA = new CreateStaffAdmin(1);

            CSA.Show();
        }
        private void AddStaff(object sender, RoutedEventArgs e)
        {
            (Stock.MainWindowDC as Hotel).NewStaff();
            CreateStaffAdmin CSA = new CreateStaffAdmin(1);

            CSA.Show();
        }
 private void ChangeStaff(object sender, RoutedEventArgs e)
 {
     if (Hotel.IsPerson != null)
     {
         CreateStaffAdmin CSA = new CreateStaffAdmin(0);
         CSA.Show();
     }
 }
        private void ChangeStaff(object sender, RoutedEventArgs e)
        {
            CreateStaffAdmin CSA = new CreateStaffAdmin(0);

            CSA.Show();
        }