Listen to changes of dependency property

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This method is definitely missing here:

DependencyPropertyDescriptor
    .FromProperty(RadioButton.IsCheckedProperty, typeof(RadioButton))
    .AddValueChanged(radioButton, (s,e) => { /* ... */ });

Caution: Because DependencyPropertyDescriptor has a static list of all handlers in application every object referenced in those handlers will leak if the handler is not eventually removed. (It does not work like common events on instance objects.)

Always remove a handler again using descriptor.RemoveValueChanged(...).

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