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.borderWidth(2);
comment.borderStyle("dotted");
comment.borderColor("red");
comment.showShadow(true);
activeSheet.getCell(5,5).comment(comment);
activeSheet.suspendPaint();
activeSheet.resumePaint();