Possible to use embedded font in TLFTextField, with TextFormat?

Question

I want to be able to dynamically change the font in a TLFTextField to an embedded font (not a device font).  I'm using Flash CS5.
The only way I've found a TLFTextField will use an embedded font is if the on-stage TLFTextField has been set to use that font through the Flash UI.  The example code I've found online (Font.registerFont etc) all works fine for a TextField, but not TLFTextField.
Below is a very simple piece of code that I expected to work.  I have a font (Earwig Factory) embedded in my library (as DF4, linkage "Earwig"), and the isFontCompatible trace call prints "true", but still it is using the device font - if I remove the system font from my machine (or view the SWF on another machine) it falls back to Times New Roman.
Can anyone give a very simple example of a TLFTextField dynamically selecting an embedded font?  Eventually I would like to store my fonts in a separate SWC / SWF, but for now just working out of the Library would be a good start.
Thanks,
Grant
import flash.text.TextFormat;
import flash.text.AntiAliasType;
import flash.text.FontStyle;
import fl.text.TLFTextField;
import flash.text.engine.FontLookup;
var format:TextFormat = new TextFormat();
format.font = "Earwig Factory"
trace("Earwig Factory isFontCompatible: " + tf.isFontCompatible("Earwig Factory", FontStyle.REGULAR) );
tf.defaultTextFormat = format;
tf.embedFonts = true;
//tf.antiAliasType = AntiAliasType.ADVANCED;
tf.setTextFormat(format);
//tf.textFlow.fontLookup = FontLookup.EMBEDDED_CFF;

Answer 1

Ok, I have some success - I can get an on-stage TLFTextField to dynamically use an embedded font.  However, this is quite complex, and doesn't use a TextFormat.  And is this seriously the way Adobe intends us to do it - if so perhaps this should be documented better?
import fl.text.TLFTextField;
import flashx.textLayout.formats.TextLayoutFormat;
import flashx.textLayout.elements.TextFlow;
import flash.text.TextFormat;
import flash.text.AntiAliasType;
import flash.text.FontStyle;
import flash.text.Font;
import flash.text.engine.FontLookup;
import flashx.textLayout.edit.ISelectionManager;
import flashx.textLayout.edit.EditManager;
import flashx.textLayout.edit.SelectionState;
var updateTF:TLFTextField = stageTF;
var applyFont:Font = new Earwig();
updateTF.embedFonts = true;
var tlfFormat:TextLayoutFormat = new TextLayoutFormat();
tlfFormat.fontFamily = applyFont.fontName;
tlfFormat.fontLookup = FontLookup.EMBEDDED_CFF;
updateTF.textFlow.invalidateAllFormats();
updateTF.textFlow.hostFormat = tlfFormat;
var prevManager:ISelectionManager = updateTF.textFlow.interactionManager;
var editManager:EditManager = new EditManager();
var sel:SelectionState = new SelectionState(updateTF.textFlow, 0, updateTF.text.length);
updateTF.textFlow.interactionManager = editManager;
editManager.applyLeafFormat(tlfFormat, sel);
updateTF.textFlow.interactionManager = prevManager;
updateTF.textFlow.flowComposer.updateAllControllers();