protected function createSheet($name) {
    $name = \Psc\PHPExcel\Helper::sanitizeSheetTitle($name);
    $this->excel->addSheet(new PHPExcel_Worksheet($this->excel, $name));
    $this->excel->setActiveSheetIndexByName($name);
    $this->sheet = $this->excel->getActiveSheet();
    
    $this->setRow(1);
  }