I have a control which inherits from (you guessed it) Control.
I want to receive a notification whenever the FontSize or Style properties are chang
You cannot externally listen to dependency property changed notifications.
You can access the Dependency Property Metadata with the following line of code:
PropertyMetadata metaData = Control.ActualHeightProperty.GetMetadata(typeof(Control));
However, the only public member that is exposed is "DefaultValue".
There are a multitude of ways to do this in WPF. But they are currently not supported by Silverlight 2 or 3.