Manually highlight Wordpress admin menu item

Question

Under Pages menu in Wordpress Admin page, I got this layout:

Pages

• Edit (url: edit-pages.php)
• Add New (url: page-new.php)
• Special Pages (url: edit-pages.php?special-pages=true)

as you can see, I've added a new submenu item called Special Pages which is pretty much a link to to Edit page with custom filter. Because Wordpress use file name to identify and highlight the submenu item, so whenever I click on Special Pages, the Edit submenu item is selected. Is there anyway to force Wordpress to select Special Pages menu item instead?

Cheers

Answer 1

better solution:

add_filter('parent_file', 'my_plugin_select_submenu');
function my_plugin_select_submenu($file) {
        global $plugin_page;
        if ('__my-current-submenu-slug__' == $plugin_page) {
            $plugin_page = '__my-submenu-slug-to-select__';
        }
        return $file;
}