How to make load action start after preload transitionInComplete() calls?

[Preloader.transitionIn()]

Hi all,
I wrote a preloader inherited from AbstractPreloader.
And I trace some infomation
override public function onProgress(e:AssetEvent):void
{
   trace(e.asset);
   trace(int(100 * e.perc));
}
 then I found the result is:
[PageAsset] root
Preloader.onProgress(0)
e.loaded = -1
e.total = 2
[PageAsset] root
Preloader.onProgress(50)
e.loaded = -1
e.total = 2
Preloader.transitionIn()
[PageAsset] root
Preloader.onProgress(50)
e.loaded = 0
e.total = 2
[PageAsset] home
Preloader.onProgress(50)
e.loaded = 0
e.total = 2
[PageAsset] home
Preloader.onProgress(100)
e.loaded = 0
e.total = 2
home_main.onAdd(e)
Preloader.transitionOut()
Preloader.transitionInComplete()
Preloader.transitionOutComplete()

I want the preload has a transition-in action.
The loader of the core should be started after the transition-in finished.
So how could I make it~~~

hard to understand your problem.

Sorry~~~my bad English
I just want the GAIA core to wait the customized preloader finished its transition-in and out.
But I got the solution~~~by using the following code

preloader.releaseGaia = Gaia.api.beforePreload(preloader.transitIn, true);

really nice that you wrote the solution here.