unable to add Crystal reports references to .net 4 WAP

hi there

I am attempting to convert a WSP to a WAP. I had already updated the WSP project to .net 4 successfully and all went well, it ran fine and things were good. but now when I am trying to add the CrystalDescisions references, they are simply not available in the reference window.

I am using VS2010 pro and win 7

I have both the cr2008 (version 12) and cr version 13 runtimes installed..

no luck though

any ideas?

thanks

nat