Cannot re-enabled disabled element

Once I set "disabled:true" on an scombobox, it will not reset to enabled with "disabled:false".
The text input box keeps the disabled property. 

I added this line of code to my javascript to "reenable" the text input:
   $(selector + ' input').prop('disabled', isDisabled)
where selector is the original id selector (e.g., "#choice") and isDisabled is a boolean flag.
