Initializing GraniteDS Tide framework - actionscript-3

Question

I'm trying to work with GDS Tide framework. My basic code is this one :
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
preinitialize="Tide.getInstance().initApplication()">
<fx:Script>
<![CDATA[
import controllers.TestController;
import events.TestEvent;
import models.TestModel;
import models.interfaces.ITestModel;
import mx.events.FlexEvent;
import org.granite.tide.Tide;
[Bindable][Inject]
public var testModel:ITestModel;
Tide.getInstance().addComponents([TestController, TestModel]);
]]>
</fx:Script>
<s:layout>
<s:VerticalLayout />
</s:layout>
<s:Label text="{testModel.ab}" />
<s:Button click="dispatchEvent(new TestEvent());" label="test !" />
I can compile and run my code but when I'm launching my application, I see blank windows, my button or my label don't appear. No errors are fired.
When I change my code to this one :
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
preinitialize="Tide.getInstance().initApplication()" creationComplete="application1_creationCompleteHandler(event)">
<fx:Script>
<![CDATA[
import controllers.TestController;
import events.TestEvent;
import models.TestModel;
import models.interfaces.ITestModel;
import mx.events.FlexEvent;
import org.granite.tide.Tide;
[Bindable][Inject]
public var testModel:ITestModel;
protected function application1_creationCompleteHandler(event:FlexEvent):void
{
Tide.getInstance().addComponents([TestController, TestModel]);
}
]]>
</fx:Script>
<s:layout>
<s:VerticalLayout />
</s:layout>
<s:Label text="{testModel.ab}" />
<s:Button click="dispatchEvent(new TestEvent());" label="test !" />
it works I see label and button but my label isn't initialized properly because my controller and model are added on mx.events.FlexEvent.CREATION_COMPLETE event.
What am I doing wrong please with the first (and recommanded) method ?