I have a set of columns in a group. Within that set I've made a sub-group.
For some reason the +/- doesn't appear for the nested group, so I can't hid
just those columns. For some reason I don't have this problem with rows.
With rows if I make a group within a group the +/- boxes appear for both and
I can hide or unhide them with ease. But for columns the +/- box only
appears in the top row. How can I make it appear for the sub-group too?