Ok, that works! Thanks!
Now I'd like to better understand what is going on. As it looks, by adding the delegate, I'm doing what in other environments would be assigning an event or callback; please execute this code in the onAfterRendering event. Is this correct?
Can I presume that onAfterRendering() executes later in time than the document ready? Document ready is traditionally where I'd want to execute code that needs to run after everything else loads, but it looks like UI5 probably waits until then to finish bootstrapping components. So after rendering is after, after. ;-) And in between, UI5 is resetting classes.