How do I set the stage quality in an AIR app?

In this article you can set the stage quality to 16X16LINEAR. I'm not able to do this in my AIR app:

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
  xmlns:s="library://ns.adobe.com/flex/spark"
  xmlns:mx="library://ns.adobe.com/flex/mx"

  width="600" height="625"
  preinitialize="preinitializeHandler(event)"
  >
  <fx:Script>
  <![CDATA[
  import mx.core.FlexGlobals;
  import mx.events.FlexEvent;
  import mx.managers.SystemManager;

  protected function preinitializeHandler(event:FlexEvent):void {
  systemManager.topLevelSystemManager.stage.quality = StageQuality.HIGH_16X16_LINEAR;
  trace("quality=" + systemManager.topLevelSystemManager.stage.quality); // HIGH
  }

  ]]>
  </fx:Script>


</s:WindowedApplication>

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