private void ReQueryOrders(object sender, EventArgs e)
        {
            var oldMergeOption = DataService.MergeOption;

            DataService.MergeOption = MergeOption.OverwriteChanges;
            var orders = DataService.Orders.Expand("OrderItems").Where(x => x.OrderStateId == OrderStates.Cooking).ToList();

            foreach (var order in orders.Where(order => !PendingOrders.Contains(order)))
            {
                PendingOrders.Add(order);
            }
            foreach (var pendingOrder in PendingOrders.Where(pendingOrder => !orders.Contains(pendingOrder)))
            {
                PendingOrders.Remove(pendingOrder);
            }
            DataService.MergeOption = oldMergeOption;
        }