private void btnPhongkham_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            pnHienthi.Controls.Clear();
            ucPhongkham Phongkham = new ucPhongkham();

            pnHienthi.Controls.Add(Phongkham);
            Phongkham.Dock = System.Windows.Forms.DockStyle.Fill;
        }
 private void btnPhongkham_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
 {
     pnHienthi.Controls.Clear();
     ucPhongkham Phongkham = new ucPhongkham();
     pnHienthi.Controls.Add(Phongkham);
     Phongkham.Dock = System.Windows.Forms.DockStyle.Fill;
 }