private void btnToathuocmau_ItemClick(object sender, ItemClickEventArgs e)
        {
            pnHienthi.Controls.Clear();
            ucDonthuocmau Donthuoc = new ucDonthuocmau();

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