Custom administrator page URL

custom_admin_ossn_com.php

<?php
function add_custom_any_existing_handler_page_inot(){
		if(ossn_isAdminLoggedin()){
				ossn_add_hook('page', 'load', 'add_custom_any_existing_handler_page');
				ossn_add_hook('page', 'override:view', 'add_custom_any_existing_handler_override');
		}
}
function add_custom_any_existing_handler_override($hook, $type, $return, $params){
		if(isset($params['handler']) && !empty($params['handler']) && $params['handler'] == 'administrator' && $params['page'][0] == 'custompage'){
				return true;
		}
		return false;
}
function add_custom_any_existing_handler_page($hook, $type, $return, $params){
		if(isset($params['handler']) && !empty($params['handler']) && $params['handler'] == 'administrator' && $params['page'][0] == 'custompage'){
				$id = $params['page'][0];
				echo 'new stuff';
		}
}
ossn_register_callback('ossn', 'init', 'add_custom_any_existing_handler_page_inot');