Hey there linhos,
Sorry for the late response ??
You can add another class to the menu item that has ab-item class with jQuery. To do that please try adding the following to your theme functions.php:
add_action('admin_head','add_adminmenu_class');
function add_adminmenu_class(){
?>
<script>
jQuery(function () {
jQuery('#wp-admin-bar-root-default a.ab-item').addClass('className');
});
</script>
<?php
}
Replace className with the actual class you want to add.
Hope this helps ??
Cheers,
Bojan