我想让我的动作列按钮在我的gridview中成为下拉按钮，这是我的代码

// ... GridView configuration ...
['class' => 'yii\grid\ActionColumn',               
            'template' => '{sell} {delete}',
            'buttons' => [
                'sell' => function ($url, $model) {
                    return Html::a('<button type="button" class="btn btn-success"><i class="glyphicon glyphicon-shopping-cart"></i></button>', $url, [
                                'title' => Yii::t('app', 'Sell Tickets'),
                                'data-toggle' => "modal",
                                'data-target' => "#myModal",
                                'data-method' => 'post',
                    ]);
                },
                'delete' => function ($url, $model) {
                    return Html::a('<button type="button" class="btn btn-danger"><i class="glyphicon glyphicon-remove-sign"></i></button>', $url, [
                                'title' => Yii::t('app', 'Delete'),
                                'data-toggle' => "modal",
                                'data-target' => "#myModal",
                                'data-method' => 'post',
                    ]);
                },
            ],
            'urlCreator' => function ($action, $model, $key, $index) {
                if ($action == 'sell') {
                    $url = Url::toRoute(['trip/sell', 'id' => $model->tripScheduleId]);
                    return $url;
                } else {
                    $url = Url::toRoute(['trip/delete', 'id' => $model->tripScheduleId]);
                    return $url;
                }
            },
        ],

这就是

我已经跟随了许多在所以或任何来源，但没有对我工作。