Project Template Wizards

I have some questions regarding project template wizards.

I created a nature that extends the java nature. I created
a wizard for creating this project and expected the java
"Specify Java Package Roots" panel to get displayed, but
it didn't. It appears it does not because there is no
'templateWizardIterator' defined for the java nature. 
I checked the projects.netbeans.org website but cannot
figure out how to specify that I want the java project
iterator (the one that will display the "Specify Java
Package Roots") to get used before my iterator. How do
I do this?

Additionally, on the first wizard panel (the one where
the user specifies the name and location of the project),
the Finish button is enabled. I don't want it enabled.
How can I disable it?

Thanks,
   -Joe-