var cssLoader:URLLoader = new URLLoader();
var cssRequest:URLRequest = new URLRequest("content.css");
var sheet:StyleSheet = new StyleSheet();
cssLoader.load(cssRequest);
cssLoader.addEventListener(Event.COMPLETE, cssLoadComplete);
function cssLoadComplete(event:Event):void
{
//trace(cssLoader.data);
sheet.parseCSS(cssLoader.data);
// Now assign the StyleSheet to a text field for example
textBox.styleSheet = sheet;
//textBox.text = styles.texttitle;
// Now you would load any external text or html into
// the text field
}