BuddyPress.org

If you want to have a look at the Suffusion theme and go to the theme’s site there is a BP extension for the theme. One of the options in the theme is to have tabs in one widget area. You might like to look at the code if you are using another theme, or just use his theme. It looks nice, but some BP plugins need a little reworking to display correctly. There are some good help in the forums though. Maybe this will help.