How to display content after product name in Magento Admin

Question

I want to add additional data after order item name in order view page.

I have added below code in config.xml file but it is replace then name. I want to append content not replace.

<adminhtml_sales_order_view>
    <reference name="order_items">
        <action method="addColumnRender">
            <column>name</column>
            <block>adminhtml/sales_items_column_name</block>
            <template>productcustomizer/sales/order/view/additional.phtml</template>
        </action> 
    </reference>
</adminhtml_sales_order_view>

It is displaying like below

I want to like below

I have tried below code in config.xml but it is not working.

<adminhtml_sales_order_view>
    <reference name="order_items">
        <block after="content" type="adminhtml/sales_items_column_name" name="additional.product.info" template="productcustomizer/sales/order/view/additional.phtml" />
    </reference>
</adminhtml_sales_order_view>

Answer 1

call your phtml file in app/design/adminhtml/default/default/template/sales/order/view/items/renderer/default.phtml

below

<?php echo $this->getColumnHtml($_item, 'name') ?>