This button selection is used internally to indicate the buttons that may be displayed.
Usually, for an XmlPage only the "edit" button is displayed, while for an XmlContent
there may be an "edit", "delete" or "new" button.
Currently there are only constants for thouse button combinations that are actually used
in practice.
Direct edit provider that uses the same JSP include based logic that has been
the default before the 6.2.3 release.
Even though placing the HTML of the direct edit buttons appears to be more "flexible" at first,
there is a large overhead invloved using this provider as compared to an implementation
like
CmsDirectEditDefaultProvider .