Код:
this.createTextField ("txt", 1, 100, 100, 100, 200);
txt.html = true;
txt.multiline = true;
txt.htmlText = '1<br>2<br>3';
this.createTextField ("txt2", 2, 400, 100, 100, 200);
txt2.html = true;
txt2.multiline = true;
txt2.htmlText = '<TEXTFORMAT LEADING="-5">1<br>2<br>3</TEXTFORMAT>';