It would be nice to have some sort of grouping item that could contain other items. This group item would be something like a radio button cluster and would allow for decorative grouping of items. But also more importantly it would allow rules to be written where the entire group could be shown and hidden as a unit.
Being able to group items within an item that provided a similar UI to other items (border, backgrounds, etc.) would make it simpler to create really good looking groups.