private async Task GetDeliveries()
        {
            sveDostave = new List <DeliveryModel>(await deliveryService.GetAllFinishedDeliveries(startDatePicker.Date, endDatePicker.Date));
            foreach (var item in sveDostave)
            {
                switch (item.DeliveryStatus)
                {
                case 4:
                    item.DeliveryStatusImageSource = "delivered.png";
                    break;

                case 3:
                    item.DeliveryStatusImageSource = "zeleni50.png";
                    break;

                case 2:
                    item.DeliveryStatusImageSource = "zuti50.png";
                    break;

                case 1:
                    item.DeliveryStatusImageSource = "crveni50.png";
                    break;

                default:
                    item.DeliveryStatusImageSource = "crveni50.png";
                    break;
                }
            }
        }