void OpenItem(int id)
{
_edit = true;
_itemId = id;
Inventory inventory = _inventoryRepository.GetById(_itemId);
OpenGroup(inventory.GroupId.Value);
pbItemPicture.Image = _pictures.RetrievePicture(inventory.Picture.ToArray());
txtItemCode.Text = inventory.ItemCode;
txtItemName.Text = inventory.ItemName;
txtBarcode.Text = inventory.Barcode;
txtUnit.Text = inventory.Unit;
txtPurchasePrice.Text = inventory.PurchasePrice.ToString();
txtSalePrice.Text = inventory.SalePrice.ToString();
txtPurchaseTax.Text = inventory.PurchaseTax.ToString();
txtSaleTax.Text = inventory.SaleTax.ToString();
}