Php WordPress管理菜单hilighting错误的CPT项目

我的自定义帖子类型有两个管理子菜单项，但只有第一个“常规设置”，在查看任一子菜单页时亮起

    add_submenu_page(
        'edit.php?post_type=landingpage',
        "General Settings", 
        "General Settings", 
        'manage_options', 
        "wp_cpt_plugin_page", 
        'my_callback'
    );
    add_submenu_page(
        'edit.php?post_type=landingpage', 
        'Form Settings',
        'Form Settings',
        'manage_options', 
        'wp_cpt_plugin_page&tab=form-settings', 
        'my_callback'
    );

查看页面时，如何使“表单设置”亮起？

检查：

add_submenu_page(
    'edit.php?post_type=landingpage', 
    'Form Settings',
    'Form Settings',
    'manage_options', 
    // This is the menu slug, you can not pass the arguments,
    // if you want to pass arguments then add only one sub menu page and
    // links with arguments, also display content with conditions of passed arguments.
    'wp_cpt_plugin_page-form-settings',
    'my_callback'
);