How to add a column to product list in Magento admin?

Question

Magento

I would like to add additional fields (for example, manufacturer) to the existing ones (ID, Name, Type, Attribute set, SKU, Price, Quantity, Visibility, Status) in the admin panel in the product catalog.
I do this:
Mage\Adminhtml\Block\Catalog\Product\Grid
In _prepareCollection I add
->addAttributeToSelect('manufacturer');
in _prepareColumns() add
$this->addColumn('manufacturer',
array(
'header'=> Mage::helper('catalog')->__('Manufacturer'),
'width' => '60px',
' index' => 'manufacturer',
'type' => 'options',
'options' => Mage::getSingleton('catalog/product_manufacturer')->
getOptionArray(), ));
nothing changes.
HELP

Answer 1

This plugin will help you: www.magentocommerce.com/magento-connect/enhanced-a...