def get_theming_attribute(self, mode, name, part=None):
        """
        looks up theming attribute

        :param mode: ui-mode (e.g. `search`,`thread`...)
        :type mode: str
        :param name: identifier of the atttribute
        :type name: str
        :rtype: urwid.AttrSpec
        """
        colours = int(self._config.get('colourmode'))
        return self._theme.get_attribute(colours, mode, name, part)