Javascript - Is There A Way To Add Client Methods To User Controls

I recently discovered the client-side methods of some of the controls in the Microsoft ajax control toolkit. For instance, with the TabContainer, I can do something like this:

$find('tabsEditJob').get_tabs()[1].set_enabled(true);

without having to resort to server side code. Is there a way to do this in your own custom user controls without too much work?UPDATE: I was going to implement show and hide methods: although setting display to none would probably work just fine, they would prefer an explicit method. I know that the ajax control toolkit controls have a set_visible method. Do user controls get this too?