Vista - C++/CLI based DependencyProperty example

Is there any examples of showing how one might add a DependencyProperty to a
C++ class? All of the examples I've found are C# based and I'm not having any
luck translating those to my C++ app.

It might be what I need is already built in - is it possible to get notified
of changes to a DrawingVisual's Offset property automatically? It's not a
DependencyProperty so I was going to wrap the DrawingVisual with my own
concept of Offset and trigger off of that.

John