SetFormatOfRange applies wrong font

Question

Hi all,
I am having an issue changing the font for text in a RichEditableText to an embedded font. I am using Flex 4.1, and my code looks more or less like this (simplified):
<fx:Style>
     @namespace s "library://ns.adobe.com/flex/spark";
     @namespace mx "library://ns.adobe.com/flex/mx";
     @font-face {
          src: url("assets/txt/BlackCasper.ttf");
          fontFamily: BlackCasper;
          embedAsCFF: true;
</fx:Style>
<fx:Script>
     <![CDATA[
     import mx.events.FlexEvent;
        public function setFont() : void {
          var newTlf : TextLayoutFormat = new TextLayoutFormat;
          newTlf.fontFamily = "BlackCasper";
          text.setFormatOfRange(newTlf);
     ]]>
</fx:Script>
<s:RichEditableText id="text"
          top="5" bottom="5" left="5" right="5"
          selectionHighlighting="{TextSelectionHighlighting.ALWAYS}"
          fontSize="70" editable="false" selectable="false"
          />
Polling Font.enumerateFonts in setFont lists "BlackCasper" correctly, so the font seems properly embedded. Also, if I set text.setStyle("fontFamily","BlackCasper"), the font is set correctly for the entire RichEditableText. However, if I call my function setFont, the selected text changes to a standard system font, instead of changing to the embedded font. I tried using a string that was not listed by Font.enumerateFonts(true) as fontFamily, and the selection changes to the same system font that it changes to if I use "BlackCasper". Finally, if I use a system font as fontFamily, then the selection changes (correctly) to the specified system font. From these observations, it would appear to me that a font family for an embedded font is not recognized by setFormatOfRange, which instead uses a default. Does anyone has any suggestions on how to fix this?
Thanks in advance!

Answer 1

That's exactly what I was trying to do:
var newTlf : TextLayoutFormat = new TextLayoutFormat;
newTlf.fontFamily = "BlackCasper";
text.setFormatOfRange(newTlf);
However, for some reason, the selection is not rendered to the embedded font "BlackCasper" as it should. Instead, the text is rendered in some random system font that is not "BlackCasper". For all widgets that accept CSS styling, I can use "BlackCasper" perfectly with setStyle. I really don't get what I am doing wrong with the way I use TextLayoutFormat