I'm trying to set a folder default view as a Dexterity content type that I created. But I see that Dexterity content types aren't in the list of possible default content views for folders. Why? Is there an option that I must set in the content type?
Content items are listed as candidate default pages if:
or
the object portal type is listed in the default_page_types of your site_properties property sheet. Find that in the ZMI (site settings -> Zope Management Interface -> portal_properties).
The default_page_types property is a list of portal_type ids; for Dexterity types that is usually a dotted name (the Dexterity manual uses example.conference.presenter for example).