bob,
You forgot the link: [
en.wikipedia.org]
Thanks for the clarification - I think that the spirit of Anon's post was, if I could paraphrase: At any given time, one only sees one underlay and one overlay. So why have to choose from an 'Overlay' and 'Underlay' chooser list at all? Why not just 'Read Underlay', 'Read Overlay' and get them directly from (wherever in) the filesystem when you want them? à la just about any other program in the world... <- note sarcasm
This would, of course, also extend to any other selection box, such as Dataset#N, Draw Dataset, etc...
BTW, I am
not Anonymous...