In Navigator, I implemented functionality that was previously just a group
that I "show"ed and "hide"ed in the Navigator mainstack, as a palette
substack of Navigator.
To do this, I created a substack, and copied over the group. All scripts
are behaviors, so the code isn't duplicated, but the control layout is,
meaning if I want to update the tool layout I need to make the changes in
If I really wanted to I could write code to copy the group from the
substack into the mainstack at runtime, but that seems weird to me.