private void SaveNew()
        {
            Strip s = (Strip)bindingStrip.Current;

            s.Nakladnik = comboBoxNakladnik.SelectedValue as Nakladnik;
            int id = _mainController.AddStrip(s);

            s.Id = id;
            bindingStrip.ResetCurrentItem();
            MessageBox.Show("Podaci pohranjeni u bazu");
            UpdateDisplay(false);
        }