Linq to XSD: cannot reference the namespace

I have recently install LinqtoXSD coz I would like to write some text on IQueryable objects which require some test data.  After I have installed LinqtoXSD, then I follow the sample found in http://www.codeproject.com/KB/linq/LINQ_to_XSD.aspx.  I have rebuild the whole solution after adding the XSD schema file.   However Resharper complain that the namespace I have defined in XSD doesn’t exist.  I have opened the object browser and check that the namespace do exist.

I don’t know what I did wrongly, then I have downloaded the demo source from above link and do a diff on the related project and solution files, but there is no findings. 

Finally I close and re-open the solution, then the namespace is displayed by intellisence and resharper no longer to complain it.

P.S.> I am using VS 2008 SP1.