Customizer Settings in Plugin

I've added 'customizer' => true, to my setting page to get my fields into the customizer, but am not seeing it display. I've added my code for the settings page to a plugin. Does it work with plugins? I'm able to see the settings page but not in the customizer.

Here is my code

// Register settings page. In this case, it's a theme options page
add_filter( 'mb_settings_pages', function ( $settings_pages ) {
    $settings_pages[] = array(
        'id'          => 'rubik',
        'option_name' => 'theme_mods_justread',
        'menu_title'  => 'Theme Options',
        'parent'      => 'themes.php',

    'customizer'  => true,
    );
    return $settings_pages;
} );

// Register meta boxes and fields for settings page
add_filter( 'rwmb_meta_boxes', function ( $meta_boxes ) {
    $meta_boxes[] = array(
        'id'             => 'general',
        'title'          => 'General',
        'settings_pages' => 'rubik',
        'fields'         => array(
            array(
                'name' => 'Logo',
                'id'   => 'logo',
                'type' => 'file_input',
            ),
            array(
                'name'    => 'Layout',
                'id'      => 'layout',
                'type'    => 'image_select',
                'options' => array(
                    'sidebar-left'  => 'http://i.imgur.com/Y2sxQ2R.png',
                    'sidebar-right' => 'http://i.imgur.com/h7ONxhz.png',
                    'no-sidebar'    => 'http://i.imgur.com/m7oQKvk.png',
                ),
            ),
        ),
    );
    $meta_boxes[] = array(
        'id'             => 'custom-colors',
        'title'          => 'Custom Colors',
        'settings_pages' => 'rubik',
        'fields'         => array(
            array(
                'name' => 'Heading Text Color',
                'id'   => 'heading-color',
                'type' => 'color',
            ),
            array(
                'name' => 'Text Text Color',
                'id'   => 'text-color',
                'type' => 'color',
            ),
        ),
    );

    return $meta_boxes;
} );