public void updateItems() {
		StockItem[] items = new StockItem[model.getWarehouseTableModel().getRowCount()];
		model.getWarehouseTableModel().getTableRows().toArray(items);
		
		productSelectionJComboBoxField.removeAllItems();
		for(StockItem item : items) {
			productSelectionJComboBoxField.addItem(item);
		}
	}