[alekslitvinenk]

Вот так

 
...
this.createTextField("my_txt", this.getNextHighestDepth(), 100, 100, 300, 100);
 var my_fmt:TextFormat = new TextFormat();
  my_fmt.color = 0xff0000;
  n = my_txt.text="Артикул: ";
  my_txt.setTextFormat(my_fmt);
...
this.createTextField("one_txt", this.getNextHighestDepth(), 20, 20, 100, 110);
 with (one_txt) {
  border = true;
  autoSize = true;
 }
 var one_format:TextFormat = new TextFormat();
  one_format.color = 0x000000;
  one_txt.text = n+this.Artikul;
  one_txt.setTextFormat(0, n.length-1,my_fmt);
  one_txt.setTextFormat(n.length-1, one_format);
...