Prado\Web\UI\TPage::getStatePersister PHP Метод

    public function getStatePersister()
    {
        if ($this->_statePersister === null) {
            $this->_statePersister = Prado::createComponent($this->_statePersisterClass);
            if (!$this->_statePersister instanceof IPageStatePersister) {
                throw new TInvalidDataTypeException('page_statepersister_invalid');
            }
            $this->_statePersister->setPage($this);
        }
        return $this->_statePersister;
    }