[flexcoders] Using Embedded and System Fonts in same text field

[a.hawksworth230]

Hi everyone, I'm having some trouble with embedded fonts. I have read 
many many threads/posts about embedded fonts and haven't really 
gotten anywhere so far.

No matter what I have tried I cannot seem to apply an embedded font 
to a section of text and have a system font applied to another 
section of text within the same text field. It almost seems as if you 
are restricted to using either system fonts or embedded fonts in the 
same text field.

Iv'e got a sample application below which allows me to apply multiple 
fonts to different selections with a text field - however when I pick 
one of my embedded fonts, a default system font is used in its place:

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; 
layout="absolute" 
creationComplete="creationComplete(event)">

  <mx:Style source=".\stylesheets\primary.css"/>
        
  <mx:VBox id="vb">
    <mx:Label text="My Title" fontFamily="AdLib RM"/>
    <mx:TextArea id="textArea" fontSize="26" width="200" height="50"/>
    <mx:ComboBox id="fontComboBox" dataProvider="{fontFamilyArray}" 
labelField="fontName" change="fontComboBox_change(event)"/>
  </mx:VBox>

  <mx:Script>
    <![CDATA[           
      use namespace mx_internal;
                        
      [Bindable] private var fontFamilyArray:Array;
                        
      private function creationComplete(event:Event):void
      {
        fontFamilyArray = Font.enumerateFonts(true);
        fontFamilyArray.sortOn("fontName", Array.CASEINSENSITIVE);
      }
        
      private function fontComboBox_change(event:Event):void
      {
        var tf:TextFormat = textArea.getTextField().getTextFormat();
        var beginIndex:int = textArea.getTextField
().selectionBeginIndex;
        var endIndex:int = textArea.getTextField().selectionEndIndex;

        tf.font = fontComboBox.selectedLabel;
        textArea.getTextField().setTextFormat(tf, beginIndex, 
endIndex);

        textArea.invalidateDisplayList();
        textArea.validateDisplayList();
      }
    ]]>
  </mx:Script>

</mx:Application>

I know the font has been embedded correctly because the label control 
has the correct font applied to it.

If I initialise the font property on the text area to my embedded 
font (fontFamily="AdLib RM") then when I start typing into the text 
area the font is correct - and I can select any of the other embedded 
fonts and they work fine. But selecting a system font for part of the 
text now causes the text to become hidden.

Any advice would be grately appreciated.
Cheers,

Andy.