BuddyPress.org

I am trying to add a custom link with dropdowns to the buddypress admin bar, how can I do this? Do you have a snippet of code?

This is the code I have so far, but can not make dropdowns work:

<?php
// custom functions for tweaking BuddyPress
function custom_adminbar_dashboard_button() {
// adds a "Dashboard" link to the BuddyPress admin bar if a user is logged in.
if (is_user_logged_in()) {
echo '<li><a href="/wp-admin/">Dashboard</a></li>';
}
}
add_action('bp_adminbar_menus', 'custom_adminbar_dashboard_button', 1);
?>