import flash.text.TextField;
import flash.text.TextFormat;
[Embed(source="your_font_file_name", fontName="font_name_temp", mimeType="application/x-font")]
public static const FONT_NAME_TEMP_FONT:Class;
// create a new TextField
var tf_tmp:TextField = new TextField();
// don't forget this one
tf_tmp.embedFonts = true;
// and finally, just use the font name you specified earlier
tf_tmp.defaultTextFormat = new TextFormat("font_name_temp", 8, 0xFFFFFF);