Extend Magento sales order grid using event observer

You can add new columns to the Sales Order grid easily by extending the block class: Mage_Adminhtml_Block_Sales_Order_Grid But this is not the preferred way due to conflict issues. Here I will show you how to extend order grid by using events(core_block_abstract_to_html_before & sales_order_grid_collection_load_before) only. For example purpose, we will be adding Payment Method to sales …

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