The medias needed to enhance the admin page.

def _media(self):
        """
        The medias needed to enhance the admin page.
        """
        media = super(EntryAdminTinyMCEMixin, self).media

        media += TinyMCE().media + Media(
            js=[reverse('tinymce-js', args=['admin/zinnia/entry']),
                reverse('tinymce-filebrowser-callback')]
        )

        return media