AIR 3.6 and MXML Applications ?

My goal here is to compile an mxml application in FB 4.7 in order to have retina quality display.

In order to do so, I followed the instructions to overlay the air sdk in FB 4.7 with the new air 3.6 sdk (AIR 3.6 SDK with ActionScript Compiler 2.0).

I also followed the instructions in the air 3.6 sdk releasenote, and in order to enable retina display I changed the namespace to 3.6 in my application descriptor file, and I also add an xml line as explained.

Now my mxml project won't compile, the error being :

Processus terminé de manière inattendue.

DVFreeThread - CFMachPortCreateWithPort hack = 0x2688e70, fPowerNotifyPort= 0x26888a0

DVFreeThread - CFMachPortCreateWithPort hack = 0x59b6d0, fPowerNotifyPort= 0x599530

invalid application descriptor: Unknown namespace: http://ns.adobe.com/air/application/3.6

Détails de la commande de lancement :  "/Applications/Adobe Flash Builder 4.7/sdks/4.6.0/bin/adl" -runtime "/Applications/Adobe Flash Builder 4.7/sdks/4.6.0/runtimes/air/mac" /SERVEUR/TraceExplorer/AirTraceExplorer/AirTraceExplorer-app.xml /SERVEUR/TraceExplorer/AirTraceExplorer

Then I read that "AIR 3.6 SDK with ActionScript Compiler 2.0" is only useful to compile AS3 project and won't work with mxml applications... Maybe that's why I have compilation problem ?

My question is : Is it possible to compile mxml projects in Retina mode with Flash Builder 4.7 ?