Le mode bureau étendu n'apparaît avec airplay et appletv sous moutain lion. Existe-t'il une solution pour retrouver le mode bureau étendu avec airplay et apple tv sous mountain lion ?

Le mode bureau étendu dans les préférences moniteur a disparu sous Mountain Lion. Seul Airplay apparaît et le mode bureau étendu ne figure pas (il n'y a que le mode recopie vidéo AirPlay).
Par conséquent, sous AppleTv 2 on ne peut pas afficher un diaporama sur le téléviseur et conserver le navigateur de diapositives sur le macbookpro, ce qui est très inconfortable pour effectuer des présentations complexes.
Existe-t'il une solution pour retrouver le mode bureau étendu dans la configuration suivante :
Macbookpro 15 pouces 2011
Mac Os X.8 Mountain Lion
AirPlay
Apple Tv 2
Merci de votre aide.
Bien cordialement.

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