def append_feincms_inlines(self, inline_instances, request):
        """
        Append generated FeinCMS content inlines to native django inlines.
        """
        for inline_class in self.get_feincms_inlines(self.model, request):
            inline_instance = inline_class(self.model, self.admin_site)
            inline_instances.append(inline_instance)

        Append generated FeinCMS content inlines to native django inlines.
        
feincms/admin/item_editor.py