private void DaoTaoToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (ttQTDT == null || ttQTDT.IsDisposed)
     {
         ttQTDT = new FrmQuaTrinhDaoTao();
     }
     ttQTDT.MdiParent = this;
     ttQTDT.Show(dockPanelMain);
 }
 private void btnDaoTao_Click(object sender, EventArgs e)
 {
     if (ttQTDT == null || ttQTDT.IsDisposed)
     {
         ttQTDT = new FrmQuaTrinhDaoTao();
     }
     ttQTDT.MdiParent = this;
     ttQTDT.Show(dockPanelMain);
     this.Activate();
 }