I had the same situation last week, and the answer was not (or at least not easy and in no way can be found after 6 hours of work on the Internet). Part of the problem is that there is no way to enable WSE from Visual Studio in VS 2010 (or VS 2008, for that matter).
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http://www.junasoftware.com/blog/how-to-use-wse-3-in-visual-studio-2010.aspx