BuddyPress.org

seems it is :

inside function bp_core_new_subnav_item( $args = ” ) :

if ( ( $bp->current_action == $slug && $bp->current_component == $parent_slug ) && $user_has_access ) {

if ( !is_object($screen_function[0]) )

add_action( 'wp', $screen_function, 3 );

else

add_action( 'wp', array( &$screen_function[0], $screen_function[1] ), 3 );

}

??