controling flexslider opening inside popup

views.js

initialize: function () {
    this.$slider = this.$('.slider');

    this.attachPopup();
    this.attachSlider();
},

attachPopup: function () {
    var self = this;
    $('.press-photo-anchor').magnificPopup({
        type: 'inline',
        callbacks: {
            elementParse: function (item) {
                self.$slider.data('flexslider').vars.animationSpeed = 0;
            },
            open: function () {
                self.$slider.flexslider(this.index);
                self.$slider.data('flexslider').vars.animationSpeed = 600;
            }
        }
    });
},

attachSlider: function () {
    var $currentSlide = this.$('#slider-current'),
        $totalSlides = this.$('#slider-total'),
        $caption = this.$('#slider-caption'),
        $slides = this.$('.press-photo-slide');

    this.$slider.flexslider({
        controlNav: false,
        prevText: '',
        nextText: '',
        start: function (slider) {
            var caption = $slides.eq(slider.currentSlide).data('caption');
            if (caption) {
                $caption.html(caption);
            } else {
                $caption.html('');
            }
            $currentSlide.html(slider.currentSlide + 1);
            $totalSlides.html(slider.count);
            $('.slides li img').click(function (event) {
                event.preventDefault();
                slider.flexAnimate(slider.getTarget("next"));
            });
        },
        after: function (slider) {
            var caption = $slides.eq(slider.currentSlide).data('caption');
            if (caption) {
                $caption.html(caption);
            } else {
                $caption.html('');
            }
            $currentSlide.html(slider.currentSlide + 1);
            $totalSlides.html(slider.count);
        }
    });
}