How to implement two-way binding on a property?

Question

I know there are lots of questions about dependency properties, and I have looked at many of them, but none of them seems to solve my problem.

I have a Window like t

Answer 1

Try changing this line:

public static readonly DependencyProperty MyTextProperty = DependencyProperty.Register("MyText",
typeof(string), typeof(TextInputWrapper), new PropertyMetadata("Empty"));

To this:

public static readonly DependencyProperty MyTextProperty = DependencyProperty.Register("MyText",
    typeof(string), typeof(TextInputWrapper), new FrameworkPropertyMetadata("Empty", FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));