title: how to make Plone Dexterity container look like Archetypes folder
body: <p>I've created a Dexterity product that includes container and non-container Dexterity content types.  Having discovered collective.documentviewer (yay! thanks! huzzah!), I'd like to use its dvpdf-group-view, but that is registered in ZCML as being for Folders, and my Dexterity containers don't qualify.  I've looked through the web interfaces available on my container type, added SiteRoot, and that enabled the view to be applied, but is also completely wrong.</p>
  
  <p>I'm confident there's a right way to do this, and I'm pretty sure it's central to the whole adapter/interface mechanism, but I just can't find it in any of the books.</p>
  
  <p>Anyone care to try an explanation?  First, the line or two that would enable a Dexterity container to pretend it's also a Folder; second, how to change the default view of a single instance of a Dexterity type so that it presents a foreign component's view?</p>
  
  <p>Thanks.</p>