BuddyPress.org

I would like add a subnav menu in a single group page (only for admin), here is my code, but it doesnt’ work

function bpdev_my_nav_setup_nav() {

global $bp, $is_single_group, $group_obj;

if ( $is_single_group ) {

$grouppo_link = $bp['root_domain'] . '/' . $bp['groups']['slug'] . '/' . $group_obj->slug . '/';

bp_core_add_subnav_item( $bp['groups']['slug'], 'update-position', __('My nav', 'buddypress'), $grouppo_link, 'bpdev_mynav', false, BP_Groups_Member::check_is_admin( $bp['logged_userid'], bp_group_id(false) ) );

}

}

of corse after it my function bpdev_mynav

UPDATE: it returns on my profile page