KVO : NSMenuItem won't update

Question

I'm creating a menuitem as following:

NSMenuItem* item = [[NSMenuItem alloc] init];
[item setTitle:device.name];
[item setImage:device.icon];

The Device name is update for some reason. One of my custom view is updated when the name is updated (Binding/KVO) but the item isn't.

Any idea why ?

Edit : The name was updated like this :

[self setValue:[[NSFileManager defaultManager] displayNameAtPath:_path] forKey:@"name"];