New Post: setCollapsed in reverse order

According to docs (PHPExcel developer documentation.doc) , 4.6.33. Group/outline a row section

You can instruct PHPExcel to add a summary below the collapsible rows (default), or above. The following code adds the summary above:
$objPHPExcel->getActiveSheet()->setShowSummaryBelow(false);

So you have to add this line of code:
$objPHPExcel->getActiveSheet()->setShowSummaryBelow(false);