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();
     });
}