/// <summary>
        /// Creator: Cash Carlson
        /// Created: 2020/04/29
        /// Approver: Rasha Mohammed
        ///
        /// Method used for Activate Button on Click
        /// </summary>
        /// <remarks>
        /// Updater: Robert Holmes
        /// Updated: 5/5/2020
        /// Update: No longer crashes if nothing is selected.
        /// </remarks>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnActivateProduct_Click(object sender, RoutedEventArgs e)
        {
            InventoryItems _inventoryItem = (InventoryItems)dgInventoryItems.SelectedItem;

            if (_inventoryItem != null)
            {
                if (!_inventoryItem.Active)
                {
                    _productManager.ActivateProduct(_inventoryItem.ProductID);
                    RefreshData();
                }
                else
                {
                    MessageBox.Show("This product is already active!");
                }
            }
        }