src/Ease/Page.php
public function addItem($pageItem, $pageItemName = null)
    {
        $result = null;
        if ($this->pageClosed === false) {
            $result = parent::addItem($pageItem, $pageItemName);
        }

        return $result;
    }
public function addItem($pageItem, $pageItemName = null)
    {
        $result = null;
        if ($this->pageClosed === false) {
            $result = parent::addItem($pageItem, $pageItemName);
        }

        return $result;
    }
Include next element into current page (if not closed).

@param mixed  $pageItem     value or EaseClass with draw() method
@param string $pageItemName Custom 'storing' name

@return mixed Pointer to included object