DependencyProperty и TwoWay биндинг

public class BindableTextEditor : TextEditor, INotifyPropertyChanged
{
    /// <summary>
    /// A bindable Text property
    /// </summary>
    public new string Text
    {
        get { return base.Text; }
        set { base.Text = value; }
    }
 
    /// <summary>
    /// The bindable text property dependency property
    /// </summary>
    public static readonly DependencyProperty TextProperty =
        DependencyProperty.Register("Text", typeof(string), typeof(BindableTextEditor), new PropertyMetadata((obj, args) =>
    {
        var target = (BindableTextEditor)obj;
        target.Text = (string)args.NewValue;
    }));
 
    protected override void OnTextChanged(EventArgs e)
    {
        RaisePropertyChanged("Text");
        base.OnTextChanged(e);
    }
 
    /// <summary>
    /// Raises a property changed event
    /// </summary>
    /// <param name="property">The name of the property that updates</param>
    public void RaisePropertyChanged(string property)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
    }
 
    public event PropertyChangedEventHandler PropertyChanged;
}