I am trying to figure out if it is possible to group some buttons in gtk together. In Aqua this is possible, eg safari uses it for the back/next buttons, and iCal for the back/day/week/month/next. This works by cutting the edges off the middle buttons, and only showing those at the ends of the groups. The results is that those buttons are visually bound to each other. I find this much more elegant than the current evolution setup, and would love to use this in gtk as well.
Thanks, Leen Toelen