Yii - Form Embed

<div class="panel panel-primary">
                    <div class="panel-heading">
                        <h3>Liga-Selektor</h3>
                    </div>
                    <div class="panel-body">
                        <p>
                        <div class="link-selektor-form">

                            <?php
                            $form = ActiveForm::begin([
                                'id' => 'liga-selektor-form',
                                'options' => ['class' => 'form-vertical'],
                                'action'  => Url::to(['link/show-league'])
                            ])
                            ?>
                            <?= $form->field($selektor, 'ligaId')->dropDownList($selektor->getLigaArray()) ?>
                            <?= $form->field($selektor, 'saisonId')->dropDownList($selektor->getSaisonArray()) ?>
                            <div class="form-group">
                                <div class="col-lg-12 text-right">
                                    <?= Html::submitButton('Anzeigen', ['class' => 'btn btn-primary']) ?>
                                </div>
                            </div>
                            <?php ActiveForm::end() ?>

                        </div>
                        </p>
                    </div>
                    <div class="panel-footer">
                        <p><img src="<?=BaseUrl::base()?>/img/icons/help/047-question.png" width="20" title="Info">
                            Wähle eine Liga/Saison aus, um die teilnehmenden Teams anzuzeigen!</p>
                    </div>
                </div>