Hi,

I am quite new to Odoo, so please bear with me :)

I am trying to extend a template `mass_mailing.email_designer_snippets`, I have created a view xml and listed it in the manifest.

```

  
    

```

If I change the `inherit_id` or the `xpath-expr` I get an error during update that the id/element was not found. So I am assuming I am doing that right.

I also created a little test controller that just renders that template:

```

 return http.request.render('mass_mailing.email_designer_snippets', {})

```

That works fine as well, however I can not get by foobar element to show up. Is there anything I am missing?

I also started Odoo with the --dev=xml feature so no database changes are loaded, still no luck.

Any ideas what I could check or try?