window.onload = function(){
       var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3});
       var sheet = spread.getActiveSheet();
var sheet = spread.getActiveSheet();
    // 行数を3に設定します。                  

sheet.setRowCount(3, GC.Spread.Sheets.SheetArea.viewport);
sheet.setValue(0, 0, "Row 1", GC.Spread.Sheets.SheetArea.viewport);
sheet.setValue(1, 0, "Row 2", GC.Spread.Sheets.SheetArea.viewport);
sheet.setValue(2, 0, "Row 3", GC.Spread.Sheets.SheetArea.viewport);
sheet.setColumnWidth(0, 90.0, GC.Spread.Sheets.SheetArea.viewport);

$("#button1").click(function(){

        // 行2の後に1行追加します              

  sheet.addRows(1, 1);
    sheet.setValue(1, 0, "Added row");
});

$("#button2").click(function(){

        // 行2の後に1行追加します
                         sheet.addColumns(1, 1);
    sheet.setValue(0, 1, "Added column");
});
}