private void button2_Click(object sender, EventArgs e)
        {
            frmNoviGrad novigr = new frmNoviGrad();

            novigr.ShowDialog();

            //CB grad
            cbGrad.DataSource = null;
            DataSet DSgrad = classSQL.select("SELECT * FROM grad WHERE id_drzava = '" + cbDrzava.SelectedValue.ToString() + "' ORDER BY grad ", "grad");

            cbGrad.DataSource    = DSgrad.Tables[0];
            cbGrad.DisplayMember = "grad";
            cbGrad.ValueMember   = "id_grad";
        }
        private void button2_Click(object sender, EventArgs e)
        {
            frmNoviGrad novigr = new frmNoviGrad();

            novigr.ShowDialog();
        }