private void collapseExpandRowColumn()throws Exception{
Workbook wb2 = new XSSFWorkbook();
Sheet sheet2 = wb2.createSheet("new sheet");
sheet2.groupRow( 5, 14 );
sheet2.groupRow( 7, 14 );
sheet2.groupRow( 16, 19 );
sheet2.groupColumn( (short)4, (short)7 );
sheet2.groupColumn( (short)9, (short)12 );
sheet2.groupColumn( (short)10, (short)11 );