private void btnNhomnguoidung_ItemClick(object sender, ItemClickEventArgs e)
        {
            pnHienthi.Controls.Clear();
            ucNhomnguoidung nhomnguoidung = new ucNhomnguoidung();

            pnHienthi.Controls.Add(nhomnguoidung);
            nhomnguoidung.Dock = System.Windows.Forms.DockStyle.Fill;
        }
 private void btnNhomnguoidung_ItemClick(object sender, ItemClickEventArgs e)
 {
     pnHienthi.Controls.Clear();
     ucNhomnguoidung nhomnguoidung = new ucNhomnguoidung();
     pnHienthi.Controls.Add(nhomnguoidung);
     nhomnguoidung.Dock = System.Windows.Forms.DockStyle.Fill;
 }