add_action('rwmb_meta_boxes', 'twt_metabox_io_blocks');
function twt_metabox_io_blocks($meta_boxes) {
    $meta_boxes[] = array(
        'id'         => 'twt-menu-block',
        'title'      => 'TWT Menu Section',
        'type'            => 'block',
        'icon'            => 'editor-table',
        'category'        => 'layout',
        //'context'         => 'side',
        'render_callback' => 'twt_render_menu_block',
        'supports' => array(
            'anchor' => false,
            'customClassName' => true,
        ),
        'fields' => array(
            array(
                'name' => 'Featured Photo',
                'id'   => 'featured_photo',
                'type' => 'single_image',
            ),
            array(
                'name' => 'Title',
                'id'   => 'title',
                'type' => 'textarea',
                'rows' => 2,
            ),
            array(
                'name' => 'Text After Title (Full Width)',
                'id'   => 'content_after_title',
                'type' => 'wysiwyg',
                'options' => array(
                    'textarea_rows' => 4,
                    'teeny'         => false,
                ),
            ),
            array(
                'name' => 'Text Before Menu Items',
                'id'   => 'content_before',
                'type' => 'wysiwyg',
                'options' => array(
                    'textarea_rows' => 4,
                    'teeny'         => false,
                ),
            ),
            array(
                'name' => 'Menu Items',
                'id'   => 'menu_items',
                'type' => 'group',
                'clone' => true,
                'sort_clone' => true,
                'collapsible' => true,
                'default_state' => 'collapsed',
                'group_title' => '{name}',
                'fields' => array(
                    array(
                        'name' => 'Dish Name',
                        'id'   => 'name',
                        'type' => 'text',
                        'size' => '100'
                    ),
                    array(
                        'name' => 'Dish Description',
                        'id'   => 'desc',
                        'type' => 'textarea',
                        'rows' => 4
                    ),
                    array(
                        'name' => 'Attributes',
                        'id'   => 'attr',
                        'type' => 'checkbox_list',
                        'options' => array(
                            'gf' => 'Gluten Free',
                            'highlight' => 'Highlight (Blue Background)',
                            'half-width' => 'Half Width',
                            'no-br' => 'No Line Break after Name',
                        ),
                    ),
                ),
            ),
            array(
                'name' => 'Text After Menu Items',
                'id'   => 'content_after',
                'type' => 'wysiwyg',
                'options' => array(
                    'textarea_rows' => 4,
                    'teeny'         => false,
                ),
            ),
            array(
                'name' => 'Attributes',
                'id'   => 'attr',
                'type' => 'checkbox_list',
                'options' => array(
                    'half-width-section' => 'Half Width Section',
                ),
            ),
            array(
                'name' => 'ID',
                'id'   => 'id',
                'type' => 'text',
                'desc' => 'for Menu Page Navigation'
            ),
        )
    );
    return $meta_boxes;
}