private void comboDataSources_SelectedIndexChanged(object sender, EventArgs e)
        {
            __cSources[0].Clear();              //清除所有商品資訊(0=所有商品資訊)

            int iCount = __cSources.Count;

            for (int i = iCount - 1; i > 0; i--)
            {
                SimpleBoundList <_ProductInfo> cProducts = __cSources[i];
                cProducts.Clear();                        //清除分類商品資訊

                __cSources.RemoveAt(i);                   //移除分類商品
                tabControl_Products.TabPages.RemoveAt(i); //移除分類商品頁籤
            }

            LoadProducts(comboDataSources.Text);
            RefreshGrid();
        }