您如何在Flex 4.5.1中設置CSS樣式的TextFlow？

我希望能夠使用CSS文件中定義的樣式來設置TextFlow元素的樣式。我目前的TextFlow實現如下所示，但對我的樣式的更改似乎不起作用。如何在Flex 4.5.1中使用CSS樣式設置TextFlow？您如何在Flex 4.5.1中設置CSS樣式的TextFlow？

// In defaults.css 
.textHeader 
{ 
    fontFamily: "Trebuchet MS"; 
    fontWeight: normal; 
    fontStyle: normal; 
    fontSize: 25; 
    color: #FF0000; 
} 

.textBody 
{ 
    fontFamily: "Trebuchet MS"; 
    fontWeight: normal; 
    fontStyle: normal; 
    fontSize: 12; 
    color: #525252; 
} 

// In MySkin.mxml 
<s:RichText left="5" right="5" top="5" bottom="5" id="richText"> 
    <s:textFlow> 
     <s:TextFlow> 
      <s:p styleName="textHeader"> 
       Cupcake cookie cotton candy chupa chups biscuit marzipan. 
      </s:p> 
      <s:p styleName="textBody"> 
       Cupcake cookie cotton candy chupa chups biscuit marzipan. 
       Jelly beans cake jujubes. Powder cotton candy apple pie applicake. 
       Bear claw powder dessert macaroon. 
      </s:p> 
     </s:TextFlow> 
    </s:textFlow> 
</s:RichText>

來源

2012-11-09 Ryan Taylor