title: Magento layout replace block with another block
body: <p>I want to replace a block in the standard layout catalog.xml with one a custom type block.</p>
  
  <pre><code>&lt;block type="catalog/product_view_attributes" name="product.attributes" as="additional" template="catalog/product/view/attributes.phtml"&gt;
      &lt;action method="addToParentGroup"&gt;&lt;group&gt;detailed_info&lt;/group&gt;&lt;/action&gt;
      &lt;action method="setTitle" translate="value"&gt;&lt;value&gt;Additional Information&lt;/value&gt;&lt;/action&gt;
  &lt;/block&gt;
  </code></pre>
  
  <p>I want to replace the above standard with my <strong>own custom block type below</strong>, but using the same "name".</p>
  
  <pre><code>&lt;block type="attributesasgroup/groupview" name="product.attributes" as="additional" template="webguys/attributesasgroup/groupview.phtml"&gt;
      &lt;action method="addToParentGroup"&gt;&lt;group&gt;detailed_info&lt;/group&gt;&lt;/action&gt;
      &lt;action method="setTitle" translate="value"&gt;&lt;value&gt;Additional Information&lt;/value&gt;&lt;/action&gt;
  &lt;/block&gt;
  </code></pre>
  
  <p>Can someone advise me the best way to do this? I don't know the XML actions and methods to use. Do i need to remove the previous block? unsetChild? IF i add a block with the same "name" and same parent, will overwrite the existing one with the same name?</p>