public function setBottomRightPosition($cell, $xOffset = null, $yOffset = null)
    {
        $this->bottomRightCellRef = $cell;
        if ($xOffset !== null) {
            $this->setBottomRightXOffset($xOffset);
        }
        if ($yOffset !== null) {
            $this->setBottomRightYOffset($yOffset);
        }

        return $this;
    }