private async void btnShipments_Click(object sender, EventArgs e)
        {
            try
            {
                var opForm = new OperationsListForm <Shipment, ShipmentProduct>("Отгрузки");
                await opForm.LoadAsync();

                opForm.ShowDialog();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        private async void btnOrders_Click(object sender, EventArgs e)
        {
            try
            {
                var opForm = new OperationsListForm <Order, OrderProduct>("Заказы");
                await opForm.LoadAsync();

                opForm.ShowDialog();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        private async void btnSupply_Click(object sender, EventArgs e)
        {
            try
            {
                var opForm = new OperationsListForm <Supply, SupplyProduct>("Поступления");
                await opForm.LoadAsync();

                opForm.ShowDialog();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }