public function renderButtons()
    {
        list($name, $id) = $this->resolveNameID();
        $buttons   = array();
        $checked   = $this->hasModel() ? (!$this->model->{$this->attribute}) : true;
        $buttons[] = \CHtml::radioButton($name, $checked, array('id' => $id . '_on', 'value' => 1));
        $buttons[] = \CHtml::label($this->offLabel, $id . '_on');
        $checked   = $checked ? false : true;
        $buttons[] = \CHtml::radioButton($name, $checked, array('id' => $id . '_off', 'value' => 1));
        $buttons[] = \CHtml::label($this->onLabel, $id . '_off');
        $buttons[] = '<span></span>';

        return \CHtml::tag('div', $this->htmlOptions, implode("\n", $buttons));
    }