show out of stock filter in magento admin product listing

Question

i want to add out of stock colum to magento admin product listing pages, so that it will be easy to view all low stock iteam easily

how can id do it via magento setting or any module ??

I tried to do it via observer but could make it work

<events>
      <adminhtml_block_html_before>
        <observers>
          <add_customer_group_column>
            <type>model</type>
            <class>customizations/observer</class>
            <method>addCustomerGroupColumn</method>
          </add_customer_group_column>
        </observers>
      </adminhtml_block_html_before>
    </events>

Observer.h

Model/Observer.php

class Devshree_Unidesing_Model_Observer {
    public function addCustomerGroupColumn(Varien_Event_Observer $observer){
        if($observer->getBlock()->getType() == 'adminhtml/sales_order_grid'){
            $block = $observer->getEvent()->getBlock();         
            $sales_order_grid_block = $observer->getBlock();

            $groups = Mage::getResourceModel('customer/group_collection')
            ->addFieldToFilter('customer_group_id', array('gt' => 0))
            ->load()
            ->toOptionHash();

            $block->addColumn('customer_group_id', array(
                'header'    => Mage::helper('customer')->__('Customer Group'),
                'width'     => '100',
                'index'     => 'customer_group_id',
                'type'      => 'options',
                'options'   => $groups,
                ));

            $block->addColumnsOrder('customer_group_id', 'shipping_name');
        }
    }
}

Answer 1

Quite another answer, but might help: https://magento.stackexchange.com/a/29213/217

Amasty has a module which might fix your problem: Extended Product Grid with Editor

And you can achieve this with GridControl when you join the stock item table into the product grid and add the status to the grid

Answer 2

If you want a free solution for this, I can recommend BL_CustomGrids. It's free and makes it possible to customize every grid you have in your admin, even those from installed extensions. Also it makes it possible to edit your data in the grid.