[elzone]

попробуй так

var myStyleSheet:TextField.StyleSheet = new TextField.StyleSheet();
myStyleSheet.setStyle("p", {color:'#000000', fontSize:'12', fontFamily:'Arial', textAlign:'right'});

news_text.autoSize = true;
news_text.html = true;
news_text.multiline = true;
news_text.wordWrap = true;
news_text.styleSheet = myStyleSheet;

news_text.htmlText = "<p><b> some text here </b></p>";