Switch to the library tab in the media uploader

I’m developing a plugin that adds a tab to the media uploader to add external videos to the media library via oembed. Everything works as expected but I need to switch to the library tab after adding a new external video via the new tab. This is part of the code I’m using:

wp.media.controller.Custom = wp.media.controller.State.extend({

    initialize: function(){
        this.props = new Backbone.Model({ custom_data: '' });
        this.props.on( 'change:custom_data', this.refresh, this );
    },

    refresh: function() {
        this.frame.toolbar.get().refresh();
    },

    customAction: function(){
        wp.media.post( 'add-oembed', {
            url:     this.props.get('custom_data'),
            post_id: wp.media.view.settings.post.id
        });

        this.frame.content.mode('browse');

    }

});

The line this.frame.content.mode(‘browse’) is supposed to make the switch to the library tab, but I’m getting an error message that says: TypeError: this.collection is undefined.

Any ideas?