public function actionIndex()
    {

        return $this->renderMany([
            'sliderSection' => [
                'slides' => ['img1.jpg', 'img3.jpg', 'img3.jpg']
            ],
            'wrapper' => [
                'innerRenders' => $this->renderManyPartial([
                    'innerView1' => [
                        'param1' => 'some data 1'.
                        'param2' => 'some data 2'
                    ],
                    'innerView2' //without passing variables
                ])
            ],
            'footer' //without passing variables
        ]);
    }