public void clear() {
            if (ava != null)
                ui.destroy(ava);
            ava = null;
            if (rmb != null)
                ui.destroy(rmb);
            if (invb != null)
                ui.destroy(invb);
            if (chatb != null)
                ui.destroy(chatb);
            if (name != null)
                ui.destroy(name);
            if (grp != null)
                ui.destroy(grp);
            name = null;
            grp = null;
            rmb = invb = chatb = null;
            id = -1;
            atime = null;
        }