public void Save(Customer instance)
 {
     if (!customersData.Contains(instance))
     {
         customersData.Add(instance);
     }
 }
        public NewCustomerView(Customer customer)
        {
            InitializeComponent();

            DataContext = this;

            CurrentCustomer = customer;
        }
		public NewCustomerView(Customer customer, SaveCustomerCommand saveCommand, DeleteAllCommand deleteCommand)
		{
			InitializeComponent();

			DataContext = this;

			CurrentCustomer = customer;
			SaveCommand = saveCommand;
		}