add below code in gridhelper file in function _prepareColumnsapp/code/local/Atwix/ExtendedGrid/Helper/Data.php
$this->addColumn public function getPostcodeColumnParams('postcode',)
{
return array(
'header' => Mage::helper('sales')->__('Postcode'),
'index' => 'postcode',
'type' => 'postcode'
'text', )
);
}
change code of file app/design/adminhtml/default/default/layout/atwix/extendedgrid.xml
<sales_order_grid_update_handle>
<reference name="sales_order.grid">
<action method="addColumnAfter">
<columnId>payment_method</columnId>
<arguments>
<header>Payment Method</header>
<index>payment_method</index>
<filter_index>payment.method</filter_index>
<type>text</type>
</arguments>
<after>shipping_name</after>
</action>
<action method="addColumnAfter">
<columnId>skus</columnId>
<arguments helper="atwix_extendedgrid/getSkusColumnParams" />
<after>payment_method</after>
</action>
</reference>
</sales_order_grid_update_handle>
to:
<sales_order_grid_update_handle>
<reference name="sales_order.grid">
<action method="addColumnAfter">
<columnId>payment_method</columnId>
<arguments>
<header>Payment Method</header>
<index>payment_method</index>
<filter_index>payment.method</filter_index>
<type>text</type>
</arguments>
<after>shipping_name</after>
</action>
<action method="addColumnAfter">
<columnId>skus</columnId>
<arguments helper="atwix_extendedgrid/getSkusColumnParams" />
<after>payment_method</after>
</action>
<action method="addColumnAfter">
<columnId>postcode</columnId>
<arguments helper="atwix_extendedgrid/getPostcodeColumnParams" />
<after>skus</after>
</action>
</reference>
</sales_order_grid_update_handle>