/// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btThemTonGiao_Click(object sender, EventArgs e)
        {
            frmTonGiao frm_TonGiao = new frmTonGiao(this.TonGiaoController);

            frm_TonGiao.WindowState = FormWindowState.Normal;
            frm_TonGiao.Show();
        }
 private void miQLTonGiao_Click(object sender, EventArgs e)
 {
     if (this.frm_TonGiao == null || this.frm_TonGiao.IsDisposed)
     {
         frm_TonGiao           = new frmTonGiao();
         frm_TonGiao.MdiParent = this;
         frm_TonGiao.Show();
     }
 }