var comment = new GC.Spread.Sheets.Comments.Comment();
comment.text("new comment!");
comment.backColor("yellow");
comment.foreColor("green");
comment.displayMode(GC.Spread.Sheets.Comments.DisplayMode.alwaysShown);
comment.padding(new GC.Spread.Sheets.Comments.Padding(2, 2, 2, 2));
activeSheet.getCell(5,5).comment(comment);