Динамическое добавление текстового поля в MVVM

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Привет,

Я новичок в WPF и пытаюсь добавить текстовые поля при нажатии кнопки с помощью ViewModel. Я могу добавлять текстовые поля, но не могу извлекать данные.

Что я уже пробовал:

Я уже пробовал их..

XML

<Button Click="Button_Click" Content="sss" VerticalAlignment="Top" ></Button>
        <StackPanel Margin="0,50,0,0">
            <Button Content="Add TextBox" Command="{Binding TestCommand}"/>
            <ItemsControl ItemsSource="{Binding SomeCollection, UpdateSourceTrigger= PropertyChanged, Mode=TwoWay}">
                <ItemsControl.ItemTemplate>
                    <DataTemplate>
                        <TextBox Text="{Binding Path=.}" />
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
            </ItemsControl>
        </StackPanel>

код поддержки

public Window3ViewModel window3 = new Window3ViewModel();
        public Window3()
        {
            InitializeComponent();
            DataContext = window3;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            // list is containing list but content is blank
            var list = window3.SomeCollection.ToList();
        }

модель представления

public class Window3ViewModel : INotifyPropertyChanged
    {
        public ObservableCollection<string> SomeCollection { get; set; }

        public ICommand TestCommand { get; private set; }

        public string Value { get; set; }

        public Window3ViewModel()
        {
            SomeCollection = new ObservableCollection<string>();
            TestCommand = new RelayCommand<object>(CommandMethod);
        }

        private void CommandMethod(object parameter)
        {
            SomeCollection.Add("");
        }

        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

public class RelayCommand<T> : ICommand
{
    readonly Action<T> _execute = null;
    readonly Predicate<T> _canExecute = null;

    public RelayCommand(Action<T> execute)
        : this(execute, null)
    {
    }

    public RelayCommand(Action<T> execute, Predicate<T> canExecute)
    {
        if (execute == null)
            throw new ArgumentNullException("execute");

        _execute = execute;
        _canExecute = canExecute;
    }

    public bool CanExecute(object parameter)
    {
        return _canExecute == null ? true : _canExecute((T)parameter);
    }

    public event EventHandler CanExecuteChanged
    {
        add { CommandManager.RequerySuggested += value; }
        remove { CommandManager.RequerySuggested -= value; }
    }

    public void Execute(object parameter)
    {
        _execute((T)parameter);
    }
}

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