private void bar_TH_TH_CLDV_LinkClicked(object sender, DevExpress.XtraNavBar.NavBarLinkEventArgs e)
 {
     if (formQLBCTHTHCLDV == null || formQLBCTHTHCLDV.IsDisposed)
     {
         formQLBCTHTHCLDV           = new QuanLyBaoCaoTHTHCLDV();
         formQLBCTHTHCLDV.MdiParent = this;
         formQLBCTHTHCLDV.Show();
     }
     else
     {
         formQLBCTHTHCLDV.Activate();
     }
 }
 private void button_QL_BC_TH_TH_CL_DV_Click(object sender, EventArgs e)
 {
     if (formQLBCTHTHCLDV == null || formQLBCTHTHCLDV.IsDisposed)
     {
         formQLBCTHTHCLDV           = new QuanLyBaoCaoTHTHCLDV();
         formQLBCTHTHCLDV.MdiParent = this;
         formQLBCTHTHCLDV.Show();
     }
     else
     {
         formQLBCTHTHCLDV.Activate();
     }
 }