Comprehensive Silverlight rendering resource?

Is there any reference available that gives a comprehensive look at how Silverlight renders the controls in an application? The kinds of things I need to know:

What is the bounding rectangle of control X? Is point P inside control X? Is control X visible to the user? How could I manually replicate Silverlight's hit testing?

Rendering and hit testing behavior seem to be governed by large numbers of properties both on a control X and on all开发者_如何学Go of its containers up to the visual tree root. Is there any comprehensive reference to help me figure out how all of this works?

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Silverlight Spy is a great tool that you can use to see all that is going on in the XAML. I've recently read parts of Silverlight in Action which has some good in depth information, but I don't know if it answers all your questions.