Following this guide: SearchContext Guide, I built a custom search with pagination, but if i reload result page (by pressing f5) or change page (by pagination links) i get an unformatted page with the following message:

Sorry, your session has timed out.

If if could serve after I change getResults method from tutorial into(changed lines of code in red):

         public function getResults($searchCriteria = array()) {
	    $start = ($this->request->getVar('start')) ? (int)$this->request->getVar('start') : 0;
	    $limit = 1;	         
	    $context = singleton('myObj')->getCustomSearchContext();
	    $records = $context->getResults($searchCriteria, null, array('start'=>$start,'limit'=>$limit));
 	    $allrecords = $context->getResults($searchCriteria);
	    if($records) {
	        $records = new PaginatedList($records, $this->request);
	        $records->setPageStart($start);
		$records->setPageLength($limit);
	        $records->setTotalItems(count($allrecords));
	    }
	    return $records;
	}

What's wrong?

Thanks in advance for help.

There is a way to solve using 'post' method (without disabling security token)?

At the moment solved using:

$form->setMethod('get');