Cannot tame the AS3 Label component in Flash

I cant get this label component to change color. Any idea why?

var myFont:Font = new Font1();
var myTextFormat:TextFormat = new TextFormat();

myTextFormat.size = 12;
myTextFormat.font = myFont.fontName;
myTextFormat.color = 0xFF0000;

windowlabel.text = "Título de Documento";
windowlabel.setStyle("embedFonts", true);
windowlabel.setStyle("textFormat", myTextFormat);

Thnaks for any ideas or help.

Att.,

Edwin