Trying to get the input to toggle read-only true/false

OK, I've really read through everything in this forum, the documentation, and outside sources. I cannot get an AW.UI.INPUT to toggle read-only/not read-only. It would seem to be a simple task since in any language I've used so far it's something like control.setEnabled(false). How can this be so difficult a task?

obj.setControlDisabled(true);

Thank you. So simple.