Hi,
I'm trying to use your example in a WPF project.
I had to download expression blend sdk so I could reference Microsoft.Expression.Interactions.
However once I did that I got a build error, it would appear this is because silverlight and wpf can't co exist in the same project:
http://stackoverflow.com/questions/6232646/errors-when-referencing-silverlight-class-library-from-wpf-application
Perhaps I'm doing something wrong or there is another option for enabling keyboard navigation in WPF?