private void saveButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                int id;
                using (pisModelDataContext cont = new pisModelDataContext())
                {
                    prednalog_za_nabavu art = new prednalog_za_nabavu
                    {
                        datum = Convert.ToDateTime(datumPicker.Text),
                        vrijeme = vrijemeBox.Text
                    };
                    cont.prednalog_za_nabavus.InsertOnSubmit(art);
                    cont.SubmitChanges();
                    var entry = (from ee in cont.prednalog_za_nabavus
                                 select ee).OrderByDescending(ee => ee.id).FirstOrDefault();
                    id = entry.id;
                    iznos.prednalogZaNabavuID = id;
                }
                updateListBox();

                //MessageBox.Show(id.ToString());
                stavkePrednalogaZaNabavuPage stavke = new stavkePrednalogaZaNabavuPage();
                stavke.idBoxx.Text = id.ToString();
                //MessageBox.Show(iznos.tempID.ToString());
                stavke.ShowDialog();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Dogodila se pogreška!!!\n" + ex.Message.ToString());
            }
        }
 partial void Updateprednalog_za_nabavu(prednalog_za_nabavu instance);
 partial void Deleteprednalog_za_nabavu(prednalog_za_nabavu instance);
 partial void Insertprednalog_za_nabavu(prednalog_za_nabavu instance);