+3  A: 

Right click on the EDMX file and select Run Custom Tool.

There is also a command line code generation tool called edmgen (available from a VS Command Prompt).

Andrew Peters
@Andrew - Thanks I knew it was something stupid but I wasn't seeing it. It later occurred to me that I needed to update the MSBuild configuration to get this to happen.
confusedGeek
Andrew... can you tell me how you updated MSBuild to run the edmgen? I need to do the same thing so I don't have to check the .designer files into svn?
PilotBob
@PilotBob - see this http://stackoverflow.com/questions/2173298/use-msbuild-to-build-entity-framework-model-without-using-the-project-file
Andrew Peters