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

 // Merge three columns with origin at cell(1,1).
 activeSheet.addSpan(1, 1, 1, 3, GC.Spread.Sheets.SheetArea.viewport);

 // Merge 2 rows x 2 columns with origin at cell(3,3).
 activeSheet.addSpan(3, 3, 2, 2, GC.Spread.Sheets.SheetArea.viewport);

 // Set on every anchor cell
 var cell = activeSheet.getCell(1, 1, GC.Spread.Sheets.SheetArea.viewport);
 cell.backColor("LightCyan");
 cell.value("Row binding");
 cell = activeSheet.getCell(3, 3, GC.Spread.Sheets.SheetArea.viewport);
 cell.backColor("LightPink");
 cell.value("Matrix binding");
 cell.hAlign(GC.Spread.Sheets.HorizontalAlign.center);
 cell.vAlign(GC.Spread.Sheets.VerticalAlign.center);
}