Is there an elegant way to make groups act like fields in parameters? I have several nested groups that I would like to act like hierarchies (hit the "+" and they expand), but still have each layer maintain its own color scheme. So if there are three tiers like Focus Groups, Core Brand Groups, and Brands, they can be expanded by layer with their own color schemes intact? I would like to avoid three filters in a hierarchy if I could, and have them expand by hitting the "+" on the axis.
Currently, one parameter cannot be used to act like the hierarchy being described. One way may be to create 2 or 3 parameters and place them on the view, however, I don't think this would get what you'd like since this is what you're trying to avoid with filters.