title: Extending magento admin with xml
body: <p>in /admin/sales_order/view/ I want to add a link on the left menu where I want to show extra product options I’ve added to in the frontend. All I need to do is extend the core xml and add somthing like:</p>
  
  <pre><code>&lt;adminhtml_sales_order_view&gt;
      &lt;reference name="sales_order_tabs"&gt;
          &lt;action method="addTab"&gt;&lt;name&gt;my_name&lt;/name&gt;&lt;block&gt;my/block&lt;/block&gt;&lt;/action&gt;
      &lt;/reference&gt;
  &lt;/adminhtml_sales_order_view&gt;
  </code></pre>
  
  <p>I tried making my own module, but I just can't get i right. Can anyone help me?</p>