Using the wizards in NetBeans 6.0 milestone 6 IDE, I added support for a new
file type to a module in my suite.  I found that I was unable to create a new
file based on the template in the generated code; specifically the Next button
in the New File Wizard was disabled.

You can reproduce this in NB6 M6 IDE as follows:

1.  Create a new suite built on the NB6m6 IDE as a platform

2.  Create a new module

3.  Follow the 'New File Type' wizard to add support for "Foo" files
with a .foo extension

4.  Run the suite and create some type of project

5.  In that new project, try to create a new Foo file using the
template created in step 3.  The "next" button doesn't work.

I found the problem by using the New File Wizard in NB 5.5 and comparing the
generated code.  The DataNode generated in the NB6 version has an extra
constructor, but this has default visibility.  Changing that constructor to
public solves the problem.