[Catalyst] Reaction Widgets questions

[Jonas Alves]

Hi,
I'm trying Reaction for the first time. I already got it to work using
the CRUDController against some tables i have in a database.
Now i'm trying to change the widgets used to display the form. How can
i tell Reaction that one field type is a
Reaction::UI::ViewPort::Field::* class?
I also want to create a new controller that show in the form just some
of the fields of a table. Is this possible? How can i do it?

Thanks for your help,
-- 
Jonas