nsDialogs: controls state on back button

I'm trying to use nsDialogs instead of InstallOptions.
I'd like that the custom page remember the state of controls (checkboxes and radiobutton) when the user comes back to this page.
I tryed to save the controls state to variables and set them on the custom page build function, but not works.
Where can I set the controls state to reflect the user choice?

Thank you

In what way does it not work?

Stu

Well, I'm very afraid but it was a copy-paste mistake.
It's works well.

Sorry