Hi, I had the same problem and I found JUST THIS PAGE on the web with something of useful (I do not know any words of Polish, thanks god for Google Translate!)

I have a little better solution and I would like to share it with you 'case YOU REALLY HELPED ME!

echo VmHTML::row('selectList', 'COM_VIRTUEMART_ORDER_STATUS_STOCK_HANDLE', 'order_stock_handle', $this->orderStatus->order_stock_handle, $this->stockHandelList);

Hope it will help. Anyway thank you again and greetings from Italy =)