Eclipse Ganymede: How do I generate a build.xml for an EAR?

Question

I am using Eclipse Ganymede I created an MDB project using the wizard. It build a simple MDB. I then created an EJB project with included the MDB project just using the wizard

Now I want to generate 1) An ear file for this 2) The build.xml to generate the ear file.

When I use export->earfile, the ear only contains a manifest and the jar for the MDB project. Shouldn't there be more?

What am I missing.

Thanks in advance!