Well I have to admit it sounds like you have smartly simplified the whole deal. 1 and 4 forces 2 and 3. Of course! Good one!
My whole paradigm was to set pane 1, 2, and 3, thus letting 4 take care of itself. I never thought about doing 1 and 4, letting 2 and 3 take care of THEMselves. Lucky for me, you've looked past "linear thinking" in a sense
If I later recognize any deficiency from that approach I'll report it. It's unlikely, but Microsoft is involved so I'll slightly hedge!
Thank you for very useful insight.