private void GenerateTestData()
        {
            var supplierList = ServiceLocator.Current.GetInstance<SupplierListViewModel>();
            var r = new Random();

            for (int i = 1; i < 4; i++)
            {
                var supplier = new SupplierViewModel() { Name = $"Supplier {i}"};
                var itemCnt = r.Next(5, 10);
                var testSkipItem = r.Next(1, itemCnt);

                for (int j = 1; j <= itemCnt; j++)
                {
                    if (j == testSkipItem)

                        continue;

                    var item = new ItemViewModel() { Name = $"Item {j}", Cost = r.Next(1, 100) };

                    supplier.Items.Add(item);
                }

                supplierList.Suppliers.Add(supplier);
            }
        }
        public void InsertSupplierCommandExecute()
        {
            var supplier = new SupplierViewModel() {Name = $"Supplier {Suppliers.Count + 1}"};

            var r = new Random();

            var itemCnt = r.Next(5, 10);
            var testSkipItem = r.Next(1, itemCnt);

            for (int j = 1; j <= itemCnt; j++)
            {
                if (j == testSkipItem)

                    continue;

                var item = new ItemViewModel() { Name = $"Item {j}", Cost = r.Next(1, 100) };

                supplier.Items.Add(item);
            }

            Suppliers.Add(supplier);
            Messenger.Default.Send(new SupplierAddedMessage());
        }