'Cleans the entry colors.'

def _clean(self, tag='yellow-background'):

    (ini, fin) = self.textbuf.get_bounds()
    self.textbuf.remove_tag_by_name(tag, ini, fin)
    self.search_entry.modify_base(gtk.STATE_NORMAL, self.bg_normal)
    self._resultsLabel.set_text('')
