AD seems to do okay with double-clicking groups to go inside the group (similar to isolation mode in AI), and I usually can get to the object thats deeper than one level, but when I get to that level and I want to select the items in that level I cannot do it with the move tool (which one can mistake for a selection tool I guess) by marquee selecting the objects in that level. I suppose this is due to what I just mentioned, there truly is not a select tool, or a direct select tool.