protected function addColumns(\MUtil_Html_TableElement $table)
    {
        $table->addColumn(
                array(\MUtil_Html::raw($this->repeater->key), 'class' => $this->repeater->class),
                $this->_('Question code')
                );
        $table->addColumn(
                array(\MUtil_Html::raw($this->repeater->question), 'class' => $this->repeater->class),
                $this->_('Question')
                );
        $table->addColumn(
                $this->repeater->answers->call($this, 'showAnswers', $this->repeater->answers),
                $this->_('Answer options')
                );
        // $table->addColumn($this->repeater->type, 'Type');
    }