private void tsThongTinKhachHang_Click(object sender, EventArgs e)
{
frmQLKH frm = new frmQLKH();
frm.MdiParent = this;
frm.Show();
}
private void TileTTKhachHang_ItemClick_1(object sender, TileItemEventArgs e)
{
pnZone.Controls.Clear();
frmQLKH frmQLKH = new frmQLKH();
frmQLKH.TopLevel = false;
pnZone.Controls.Add(frmQLKH);
frmQLKH.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
frmQLKH.AutoScroll = true;
frmQLKH.Dock = DockStyle.Fill;
frmQLKH.Show();
}