title: Does a CustomAction menu item apply to child content types?
body: <p>I have a CustomAction definition with RegistrationType="ContentType":</p>
  
  <pre><code>&lt;Elements xmlns="http://schemas.microsoft.com/sharepoint/"&gt;
      &lt;CustomAction
          Id="Sample.DuplicateListItem"
          Location="EditControlBlock"
          Title="Copy Item..."
          RegistrationType="ContentType"
          RegistrationId="0x01010012"&gt;
          &lt;UrlAction Url="~site/_layouts/TheKidListActions/CopyListItem.aspx?List={ListId}&amp;amp;ID={ItemId}"/&gt;   
      &lt;/CustomAction&gt;
  &lt;/Elements&gt;
  </code></pre>
  
  <p>All document libraries which use this content type will show this context item menu.</p>
  
  <p>My question is, will this context item menu be shown for a list which has a content type  0x010100120013 (inherited from 0x01010012)?</p>