How to block an object (visible but inactive)?

I have a fillable form with objects like radio buttons, check boxes, and text fields. When user selects a choice by clicking on a radio button, I want some of the objects, like all radio buttons in the radio button group, still visible but not selectable. I tried the following but it does not work as expected:

// form1.page1.showControlButton.hide::click - (JavaScript, client)

....

page1.optionButton.presence = "inactive";

page1.optionButton.b1.presence = "inactive";

page1.optionButton.b2.presence = "inactive";

page1.optionButton.b2.presence = "inactive";

This is my first time using the feature (visible/hidden/inactive) in LiveCycle designer. I can hide them but can't block them. Can anybody help me?

Thanks

Sam