Nav menus administration. Open all metaboxes by default

When you have a multisite installation, it is possible that the bloggers you host. have trouble to create menus for their blog.  The default behavior of wordPress in wp-admin/nav-menus.php is to have hidden the posts, tags and formats metaboxes, which make the process of finding the things they want to include in the navigation menus more difficult. The following snippet opens by default these metaboxes in wp-admin/nav-menus.php.

Just paste the following in your /plugins/custom.php or /plugins/bp-custom.php file.