$(document).ready(function () {
      var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3});
      var activeSheet = spread.getActiveSheet();
     // オーバーフロー表示を有効にします。
    activeSheet.options.allowCellOverflow = true;
     activeSheet.getCell(1, 3).value("Any characters pushed outside the cell width are displayed as overflows.");
  });