[flexcoders] Custom event not dispatching as expected

[guillaumeracine]

I did a sample app to test a custom event.
I have a class named ModelLocator that extends EventDispatcher.
This class dispatch an event of type TreeDataLoadedEvent.
The main application listen to it but it seems that it never catch the
TreeDataLoadedEvent object that is dispatched.
Is it because the modelLocator object is not a child of the application?

If so how to get this thing done...

<mx:Application
        xmlns:mx="http://www.adobe.com/2006/mxml";
        layout="absolute"
        creationComplete="creationCompletedHandler(event);">
        
        <mx:Script>
                <![CDATA[
                        import events.TreeDataLoadedEvent;
                        import model.ModelLocator;
                        import mx.controls.Alert;
                        
                        public var modelLocator:ModelLocator = 
ModelLocator.getInstance();
                        
                        private function btnClicked(evt:Event):void{
                                modelLocator.dispatchEvent( new 
TreeDataLoadedEvent() );
                        }
                        
                        private function eventReceived(evt:Event):void{
                                Alert.show("Event received!"); //This is not 
shown
                        }
                        
                        private function 
creationCompletedHandler(evt:Event):void{
                                this.addEventListener( 
TreeDataLoadedEvent.LOAD_COMPLETED_EVENT,
eventReceived );
                        }
                ]]>
        </mx:Script>
        
        <mx:Button id="btn" x="209" y="299" label="Button"
click="btnClicked(event);"/>
        
</mx:Application>