window.onload = function(){
       var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3});
       var activeSheet = spread.getActiveSheet();

activeSheet.setColumnCount(5);

     $("#button1").click(function(){
         //Select entire row 4.
        activeSheet.addSelection(3, -1, 1, -1);
     });

     $("#button2").click(function(){
         //Remove the selections in the sheet.
         activeSheet.clearSelection();
     });
                      }