private void LoaiCongtrinh_LinkClicked(object sender, DevExpress.XtraNavBar.NavBarLinkEventArgs e)
 {
     if (formLoaiCongTrinh == null || formLoaiCongTrinh.IsDisposed)
     {
         formLoaiCongTrinh           = new QL_LoaiCongTrinh();
         formLoaiCongTrinh.MdiParent = this;
         formLoaiCongTrinh.Show();
     }
     else
     {
         formLoaiCongTrinh.Activate();
     }
 }
 private void button_loaicongtrinh_Click(object sender, EventArgs e)
 {
     if (formLoaiCongTrinh == null || formLoaiCongTrinh.IsDisposed)
     {
         formLoaiCongTrinh           = new QL_LoaiCongTrinh();
         formLoaiCongTrinh.MdiParent = this;
         formLoaiCongTrinh.Show();
     }
     else
     {
         formLoaiCongTrinh.Activate();
     }
 }