NSUserNotification customisable app icon?

Question

I just noticed that iTunes' notification icon was replaced by album covers:

And it's app icon was a small one near the title, which is a bit different from the ones I knew of:

Where I can only add images as part of the content, not the app icon.

Is there an undocumented NSUserNotification API that I didn't know?

Answer 1

NVM, I found the answer.

iTunes use private APIs.

NSUserNotification *notification = [NSUserNotification new];
[notification setValue:anImage forKey:@"_identityImage"];