public function run()
    {
        $size = 20;
        $saved = Yii::$app->session->get('per-page');
        if (in_array($saved, $this->pageSizes)) {
            $size = $saved;
        }
        $selected = Yii::$app->request->get('per-page');
        if (in_array($selected, $this->pageSizes)) {
            $size = $selected;
        }

        Yii::$app->session->set('per-page', $size);

        return Html::tag('div', Html::tag('div',
            Html::label(Yii::t('podium/view', 'Results per page'), 'per-page')
            . ' '
            . Html::dropDownList('per-page', $size, $this->pageSizes, ['class' => 'form-control input-sm', 'id' => 'per-page']),
            ['class' => 'form-group']
        ), ['class' => 'pull-right form-inline']) . '<br><br>';
    }