If the given palette matches an existing one, shows it in the
        combobox

def set_palette_name(self, palette_name):
        """If the given palette matches an existing one, shows it in the
        combobox
        """
        combo = self.get_widget('palette_name')
        found = False
        log.debug("wanting palette: %r", palette_name)
        for i in combo.get_model():
            if i[0] == palette_name:
                combo.set_active_iter(i.iter)
                found = True
                break
        if not found:
            combo.set_active(self.custom_palette_index)