Grail value bean value from switch

I'm a bit new to grails (not groovy though) and I'm working on a sample CRUD app. The problem I am trying to solve is how to set a property on a bean based on a switch before updating it in the database. Is the http://www.grails.org/plugin/form-helper form helper a plugin where to go? Will the bean be set regardless of whether the button is actually clicked by the user or if it is left at the default?

thank you jeff