Recursive Stackscripts

Maybe I'm hoping for too much. Or maybe I'm just not doing it correctly. But when using recursive stack scripts why don't the UDF items pop up for building off the lowest one?

I.e: Script 1 does a secure(ish) setup

Script 2 installs Apache/SQL/PHP and has at the start.

I would select Script 2 for the rebuild.

When I do this non of the UDF items are available to fill.

Hope this is semi-coherent.

EDITED Title so it didn't say Secursive….