/// <summary> Dispay navigation buttons </summary>
 private void ShowNavigationButtons()
 {
     this.btnGotoShop.Visible   = !this.IsPrintDevice();
     this.btnPrintOrder.Visible = !this.IsPrintDevice();
     this.btnGotoShop.Text      = ItemUtil.GetNavigationLinkTitle(NavigatationLinkShop, true);
     this.btnPrintOrder.Value   = Translate.Text(Texts.PrintThisPage);
 }