/// <summary>
 /// all view logic for when an invoice is selected.
 /// </summary>
 /// <param name="invoice"></param>
 private void setCurrentInvoice(clsMainLogic.Invoice invoice)
 {
     try{
         currentInvoice = invoice;
         currentInvoice.LoadItems(controller.getInvoiceDetails(invoice.InvoiceNum));
         updateInvoiceDisplay();
     }
     catch (Exception ex) {
         HandleError(MethodInfo.GetCurrentMethod().DeclaringType.Name,
                     MethodInfo.GetCurrentMethod().Name, ex.Message);
     }
 }