Updates the disabled style for all descending views when a view's isEnabled value changes to false.  This allows you to disable a top-level view and have all child views update visually, which makes it very easy to disable an entire form with one bound isEnabled value on the wrapping view.
Updates the isEnabled value of collection itemView's to match the isEnabledInPane (combination of isEnabled + all ancestor's isEnabled) value of the collection.