var ntheme = new GC.Spread.Sheets.Theme("customThemeColor");
ntheme.colors().accent1("lightgreen");
ntheme.colors().followedHyperlink("orange");
ntheme.colors().hyperlink("red");
ntheme.colors().name("test");
activeSheet.currentTheme(ntheme);
activeSheet.getCell(0, 0).backColor("accent 1");
activeSheet.getCell(1, 0).backColor("followedHyperlink");
activeSheet.getCell(2, 0).backColor("hyperlink");
var cname = ntheme.getColor("accent 1");
alert(cname);