you can get to ObjectContext because DbContext mostly wraps ObjectContext...
see
http://msdn.microsoft.com/en-us/library/gg696590%28v=vs.103%29.aspx
http://msdn.microsoft.com/en-us/library/system.data.entity.dbcontext%28v=vs.103%29.aspx
http://msdn.microsoft.com/en-us/library/dd283139.aspx