I'm reviving an old thread here because this seems to be the only relevant thread to my current problem:
Is it possible to do this work programatically? More specifically, can I change subset of boolean text properties using selection start/end? It doesn't appear so. I've attached a snippet that shows that text selection start/end seems to work for a string control, but not for boolean text.
I think you might have better luck posting this question as a completely new discussion forum post to get more eyes on it. You can link this previous post if you'd like!