def tabs(self):
        url = IURL(self.context, self.request)
        list=[(u"delete",u"Delete",IDeletable),
              (u"display",u"Display",IDisplayable),
              #(u"rename",u"Rename",IRenameable),
              (u"edit",u"Edit",IEditable),
              (u"addContainer",u"Add Container",IAddContainer)
        ]
        for id, name, anInterface in :
            if not anInterface.providedBy(self.context):
               continue
            import pdb; pdb.set_trace()
            yield {
                'active':  (getattr
                    (self.view,'cromlech.context').providedBy(self.context)
                     is anInterface),
                'title': title.get(view) or id,
                'url': '%s/%s' % (url, id),
            }


        for id, view in self._tabs:

            #Basically if the views are for Ileaves
            #And the context is ILeaf,
            #or vice versa display them.
            #Really this should be
           #if not (( getattr(view,'cromlech.context')==ITreeLeaf) ==
            #        (ILeaf.providedBy(self.context))):

            if not getattr(view,'cromlech.context').providedBy(self.context):
               continue

            yield {
                'active': self.view.__class__ is view,
                'title': title.get(view) or id,
                'url': '%s/%s' % (url, id),
            }