I was able to update the text box in the child from the parent code. I think that will be enough evidence to proceed with some code revisions in both the parent and child so that the user gets a fluid interaction without any undue clumsiness.
I'm going to leave this thread open for the rest of the evening and tomorrow. I'll post back anything I find noteworthy for the benefit of anyone that might have been following the thread.
As always, you've been a great help June.
Bill