Gets the identifier for the dependency property where the value change occurred.
Assembly: System.Windows (in System.Windows.dll)
If the action of your PropertyChangedCallback changes the property value again, you can use SetValue, passing for the dp parameter and using this in the callback scope as the invoking DependencyObject.
The can be particularly relevant if used within a common PropertyChangedCallback that is registered for several properties, and it is necessary to disambiguate which property change invoked the callback.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.