private void pnHopDong_Click(object sender, EventArgs e)
        {
            a.ColorClick(sender);
            uc_ThemDonHang ds = new uc_ThemDonHang();

            form.changeUC(ds, pnNhanVien);
        }
        private void label2_Click(object sender, EventArgs e)
        {
            a.LabelClick(sender);
            uc_ThemDonHang ds = new uc_ThemDonHang();

            form.changeUC(ds, pnNhanVien);
        }