Thank you so much Garan! I got a bit farther and also realized I had another issue in my actual code, which this helped me to solve.
I was doing this:
self.myCheckbox:CheckedChanged = function(sender,args)
-- toggle enabled flag of a field based upon a checkbox
...and getting an error still, but changed that to
self.myCheckbox.CheckedChanged = function(sender,args)
...and everything works as desired.
I've been relying on your Plugins for noobs post heavily, thanks. It's what's gotten me as far as I have. I'm an old hand programmer but Lua is entirely new to me, so I think a lot of the problems I have had and will have with syntax are just a matter of experience. Thank you again for the help!