Celebration was premature
Using BOTH my version HELEN’s version works great until one tries to collapse JUST the CURRENTLY expanded Cb… it won’t collapse… the ONLY way to collapse a Cb that is expanded is to expand another Cb. And, because subsequent Cb’s are UNDER (hidden by) previous expanded Cb’s above it, the user can’t get to the subsequent Cb’s unless they click on a LOWER Cb… unacceptable.
Note, there is another way to close the currently expanded Cb, it is to click and drag the Cb slightly… it then collapses. (NOT a realistic GUI). But maybe it’s a lead for a real solution? I don’t have the experience/expertise to do that follow-up.
Unless someone can figure out how to do this, I’m giving up on THIS FUNCTIONALITY in the apps and will have to depend upon the user to close a Cb when they are finished with it…
I have personally learned a lot going through this, so not all is lost!