How to become an expert in WPF?

Question

Yes, indeed. To anybody who's sole goal is to become an expert in WPF (or you already are) what would you recommend doing to achieve this goal?

• What books would you recommend going through?
• What topics to cover in detail?
• What achievements to make to become an expert?
• Would you recommend to become an expert in other areas as well (.net BCL, Silverlight, Direct 2D)?
• Should this person develop communication skills as well?
• Do you think that such a person like "WPF expert" can even exist?

Thank you!

Answer 1

Develop many applications using WPF.

It's such a huge platform, I feel that you only learn by forcing yourself to use the platform, in as many ways, for as many different types of applications, as possible.