Css.setStyle issue

1

Hi, I have my text in an xml file, using html text/CDATA, and in my flash file I have this code:


function LoadXML(e:Event):void {
        xmlData = new XML(e.target.data);
        mytxt.htmlText = xmlData.myXMLText.text().split("\r").join("");
        var css = new StyleSheet();
            css.setStyle("a:link", {color:"#CCCCCC"});
            css.setStyle("a:hover", {color:"#999999"}); 
            css.setStyle("h1", {fontSize:"23", color:"#000000"});
        mytxt.styleSheet = css;
        trace(xmlData);

The links are working fine.
But when I try to make sentences within a <h1> tag in xml, nothing happens.
What do I do wrong??