function downloadWijmoExcel() {
    wjcGridXlsx.FlexGridXlsxConverter.saveAsync(
      grid,
      {
        includeColumnHeaders: true,
        includeCellStyles: true,
        formatItem: exportFormat
      },
      "FlexGrid.xlsx"
    );
  }

 function exportFormat(args) {
    var p = args.panel,
      row = args.row,
      col = args.col,
      xlsxCell = args.xlsxCell;
  if (p.cellType === wjGrid.CellType.ColumnHeader) {
      xlsxCell.style.hAlign = 2; //수평 정렬
      xlsxCell.style.vAlign = 1; // 수직 정렬
    }
  }