SideNav from Kartik does not mark me as active the selected item

Well, I'm using a left side menu with the Kartik SideNav widget, according to the examples you should leave the selected item marked as active, but do not suffice, as expected.

What do I need to configure to make the widget work as it should be?

This is the code I use

<?php
echo SideNav::widget([
    'type' => SideNav::TYPE_INFO,
    'heading' => 'Contratación',
    'items' => [
        [
            'url' => Yii::$app->homeUrl.'contrato/index?cual=1',
            'label' => 'Contratos Vigentes',
            'icon' => 'edit'
        ],
        [
            'url' => Yii::$app->homeUrl.'contrato/index?cual=2',
            'label' => 'Contratos Expirados',
            'icon' => 'edit'
        ],
        [
            'url' => Yii::$app->homeUrl.'cont-suplemento/index',
            'label' => 'Suplementos',
            'icon' => 'edit'
        ],
    ],
]);

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