private void bar_DichVuBuuChinh_LinkClicked(object sender, DevExpress.XtraNavBar.NavBarLinkEventArgs e)
 {
     if (formDVBCVT == null || formDVBCVT.IsDisposed)
     {
         formDVBCVT           = new QL_DichVu_BuuChinh_VT();
         formDVBCVT.MdiParent = this;
         formDVBCVT.Show();
     }
     else
     {
         formDVBCVT.Activate();
     }
 }
 private void button_dichvubcvt_Click(object sender, EventArgs e)
 {
     if (formDVBCVT == null || formDVBCVT.IsDisposed)
     {
         formDVBCVT           = new QL_DichVu_BuuChinh_VT();
         formDVBCVT.MdiParent = this;
         formDVBCVT.Show();
     }
     else
     {
         formDVBCVT.Activate();
     }
 }