public function action_admin_header($theme)
{
// Since this is the core admin theme, all of these named StackItems should have been added via Stack::action_register_stackitems()
Stack::add('admin_header_javascript', 'jquery.color');
Stack::add('admin_header_javascript', 'jquery-nested-sortable');
Stack::add('admin_header_javascript', 'humanmsg');
Stack::add('admin_header_javascript', 'jquery.hotkeys');
Stack::add('admin_header_javascript', 'locale-js');
Stack::add('admin_header_javascript', 'media');
Stack::add('admin_header_javascript', 'admin-js');
Stack::add('admin_header_javascript', 'crc32');
Stack::add('admin_header_javascript', 'select2');
Stack::add('admin_stylesheet', 'jquery.ui-css');
Stack::add('admin_stylesheet', 'select2-css');
if (defined('DEBUG_ADMIN')) {
Stack::add('admin_footer_javascript', 'less');
Stack::add('admin_stylesheet', 'admin-less');
} else {
Stack::add('admin_stylesheet', 'admin-css');
}
}