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.fontFamily("Comic Sans MS");
comment.fontSize("10pt");
activeSheet.getCell(5,5).comment(comment);