var printInfo = new GC.Spread.Sheets.Print.PrintInfo();
printInfo.pageHeaderFooter({
     normal: {
         header: {
             left: "Header Left"
         }
     }
});
printInfo.paperSize(new GC.Spread.Sheets.Print.PaperSize(GC.Spread.Sheets.Print.PaperKind.a4));
spread.print(0);