public NewPersonWindow(Person person)
 {
     InitializeComponent();
     this.person = person;
     DataContext = this.person;
     isNew = false;
 }
        public PersonViewWindow(Person person)
        {
            InitializeComponent();

            DataContext = person;
        }
 public NewPersonWindow()
 {
     InitializeComponent();
     person = new Person();
     DataContext = person;
 }
 public NewNumberWindow(Person person)
 {
     InitializeComponent();
     this.person = person;
 }