Clicking the combination box reveals the other Groups already defined, including the default "Friends" group provided by the system. Selecting an entry updates the buddy icons shown on the main canvas for that Group. Clicking the erase (-) toolbar button would raise an alert "Confirm erase: Are you sure you want to permanently erase the '<group_name>' group? (Keep/Erase)". Typing a new string into the combination box would activate the add group (+) toolbar button. Typing a new group name and then clicking (+) would create the group and clear the canvas of previously shown buddies (you'll see none here until you add them from neighborhood).