Rodrigo,
Já deu uma olhada nestes links:
http://blog.opennetcf.com/ayakhnin/PermaLink,guid,34221459-8db8-41ef-91c7-5514eade8fca.aspx
http://social.msdn.microsoft.com/forums/en-US/netfxcompact/thread/7771b12a-6b98-47d2-b253-c970b7c32ee0/
?