private void ChooseExistingButton_Click(object sender, EventArgs e)
        {
            ChooseExistingCommodityDialog dialog = new ChooseExistingCommodityDialog(systems);

            if (dialog.IsDisposed == false)
            {
                dialog.ShowDialog();

                if (string.IsNullOrEmpty(dialog.Result) == false)
                    CommodityTextBox.Text = dialog.Result;
            }
        }
        private void ChooseExistingButton_Click(object sender, EventArgs e)
        {
            ChooseExistingCommodityDialog dialog = new ChooseExistingCommodityDialog(systems);

            if (dialog.IsDisposed == false)
            {
                dialog.ShowDialog();

                if (string.IsNullOrEmpty(dialog.Result) == false)
                {
                    CommodityTextBox.Text = dialog.Result;
                }
            }
        }