Moe, thanks. Yes I tried several ways.
Rod, Hi have we met? Yes I'm aware of the top pane and the bottom (file list) pane. But it's not accurate to say it shows two levels. It shows one level (above) and the lower pane shows as files the sum of everything selected in the top pane.
So there will be no misunderstanding, I'll describe what I'm trying to do. First, some definitions, although I'll simplify a bit. First, I am using for this view a couple of user-defined fields:
Composition: this is a calculated field, and is a group of tracks that make up a single classical composition
Grouping: this is a group of albums (all albums that share the same value of [Grouping])
GroupSet: This is a set of Groups (via the [Grouping] field).
For example, an album of Mozart Piano Concertos may have 40 tracks, but 10 Compositions.
Further, each of the Mozart symphonies is in its own Album. Since there are more than 40, it makes for a less cluttered view to group them. So I have a group of "Mozart Symphonies (Gardiner)". There's another group of "Mozart Symphonies (Solti). Those two groups (along with others) can be in the GroupSet "Mozart Symphonies".
So I have a 5-level view defined as you see here:
The actual definitions are:
Album Artist (auto) = [Album Artist (Auto)]
GroupSet Expression = FirstNotEmpty([GroupSet],[Grouping],[Album])
Grouping Expression = FirstNotEmpty([Grouping],[Album])
Album = [Album]
Composition = [Composition]
So in this next image, you see after drilling into Mozart, the top pane is showing albums (wich are not in groups) along with the GroupSet "Mozart Symphonies".
You can drill into Mozart Symphonies and you see "Mozart Symphonies (Gardiner)" and "Mozart Symphonies (Solti)" etc. Then you drill down to the album level, and finally to the composition level.
The problem comes when you drill into something that is NOT in a GroupSet or Group, just an individual album. If you do this in theater view, it drops right to the bottom level, Compositions. Wonderful! But look what you get in Standard View if you instead drill into an individual album "Mozart Wind Concertos":
Look at the legend up top. You have to drill through those two extra levels (GroupSet and Grouping) that both have only one entry, before you can get to the compositions. The list of Compositions is NEVER displayed in the bottom pane in standard view, because Compositions isn't a file, it's just a construct. That's fine. If you click on one of those compositions in the top pane, it shows you just those 3 tracks that match it in the bottom pane. That's great too.
The only problem is that Theater View intelligently skips useless levels, and Standard View does not, as far as I can tell. I consider this pedantry on the part of Standard View to be a shortcoming, that makes me click extra times needlessly.
So now you know exactly what I mean. Can you come up with something clever, or is your answer still the same?
And yes I used your attachment trick!