Hey Claes,
unfortunately already tried that step. If I do, first rectagle with 3d, group the rectagle, add stodlg with the right attribute, than add text and group again, the first problem is there back again (text masks the button).
Edit: Sorry I was wrong, before the group with text, the button still acts the same but the text masks the button, after group with text, the previous stodlg action is gone as the 3d relief is gone too. When adding back again the stodlg attribute, the button acts as a flat rectangle.