[AS3] embed regular,bold font into a textArea

[peptobismol]

I can embed one font fine but it doesn't work when I need a bold font with regular. The textArea is outputting html text like '<b> Hi </b> there.'

I'm trying to embed 2 fonts here but it looks like you can only embed one font into the textArea.

var myFont = new MyriadFont();
var tf:TextFormat = new TextFormat(); 
tf.color = 0xFFFFFF; 
tf.font = myFont.fontName; 
tf.size = 12; 

var myFont2 = new MyriadFontBold();
var tf2:TextFormat = new TextFormat(); 
tf2.color = 0xFFFFFF; 
tf2.font = myFont2.fontName; 
tf2.size = 12; 

fbBox.setStyle("embedFonts", true);
fbBox.setStyle("textFormat", tf); 
fbBox.setStyle("textFormat", tf2);

searches turn up nothing . thanks.