MsBuild version

[trailway]

I am trying to build a SandCastle shfpbproj which requires using msbuild. When I add a Visual Build step to do this then SandCastle has issues. The problem is described here and relates to using version 4 of msbuild:

http://shfb.codeplex.com/Thread/View...ThreadId=50652

If I run the 3.5 version of msbuild from the command line by hand then it works.

Question:

How do I have an msbuild step which uses the 3.5 version so that I can build SandCastle?