Grido\Grid::handlePerPage PHP Method

    public function handlePerPage(\Nette\Forms\Controls\SubmitButton $button)
    {
        $perPage = (int) $button->form['count']->value;
        $this->perPage = $perPage == $this->defaultPerPage ? NULL : $perPage;
        $this->page = 1;
        $this->reload();
    }