code: protected void committableUpdated() {
  		boolean committable = isCommittable();
  		if (hasChanged(oldCommittable, committable)) {
  			oldCommittable = committable;
  			firePropertyChange(COMMITTABLE_PROPERTY, !committable, committable);
  		}
  	}
docs: Fires the necessary property change event for changes to the committable
  property. Must be called whenever the value of committable is changed.