private void button2_Click(object sender, EventArgs e)
 {
     this.Close();
     ObslugaOkien.idzDo("Okno Glowne Kasjera");
 }
 private void btn_dalej_Click(object sender, EventArgs e)
 {
     ObslugaOkien.idzDo("Okno Glowne Kasjera");
     this.Close();
     ekran_wyb_klient.Close();
 }