public function setBreak($pCoordinate, $pBreak)
    {
        // Uppercase coordinate
        $pCoordinate = strtoupper($pCoordinate);

        if ($pCoordinate != '') {
            if ($pBreak == self::BREAK_NONE) {
                if (isset($this->breaks[$pCoordinate])) {
                    unset($this->breaks[$pCoordinate]);
                }
            } else {
                $this->breaks[$pCoordinate] = $pBreak;
            }
        } else {
            throw new Exception('No cell coordinate specified.');
        }

        return $this;
    }