applicationComplete event not fired when Flex Application (SWF) loaded into Flex Application

Using Flex SDK 4.6 and Flash CS6,   I am able to to load an internally developed Flex Application (MXML project) into a Flash container application using code similar to the following:

var loader:Loader = new Loader();
// flexContainer is a MovieClip object
flexContainer.addChild(loader);
 loader.contentLoaderInfo.addEventListener(Event.COMPLETE, function(event:Event) : void { 
      event.target.content.addEventListener("applicationComplete", function(event:Event) : void {
           var view:IView = event.target.application as IView;
      });
}); 
 loader.load(new URLRequest("child.swf"));

However, when running inside of a Flex container application (MXML project), the "applicationComplete" event is never fired. I can see that the child.swf (and dependent RSLs) are loaded by watching the debug console.

Any ideas?

Unfortunately, I cannot use Flex Modules or any other Flex specific construct to get this working. Ultimately this must work inside a Flash container; however, our testing platform dictates that these Flex components be loaded into a Flex Application container.