Alors je confuse.
Voici ce que dit la doc Apple :
"Utility Windows
You can create a modeless utility window, such as a tools palette, to present controls or settings that affect the active document window. [...]
A user can open several utility windows at a time; they float on top of document windows. When a user makes a document active, all of the applications utility windows should be brought to the front, regardless of which document was active when the user opened the utility window. When your application is inactive, its utility windows should be hidden.
"
On ne doit pas parler de la meme chose...
Cordialement