private void btnNhapXuatTon_Click(object sender, EventArgs e)
        {
            FrmTonKho frm = new FrmTonKho();

            //frm.ShowDialog();
            CreateTab(stcMenu, "Tồn kho", "stiTonKho", "stcpTonKho", frm);
        }
 private void btnNhapXuatTon_Click(object sender, EventArgs e)
 {
     FrmTonKho frm = new FrmTonKho();
     //frm.ShowDialog();
     CreateTab(stcMenu, "Tồn kho", "stiTonKho", "stcpTonKho", frm);
 }