About Menu in my Xcode 4 Project remains disabled

Question

Unfortunately the About Menu of my project is disabled and I can´t enable it.

I set up an IBOUTLET

IBOutlet NSMenuItem *aboutMenu;

and then I tried to enable it like this in applicationDidFinishLaunching, although I think it should not be disabled until I say so:

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification   {
   [aboutMenu setEnabled:TRUE];
}

Anyway, it´s still disabled.

Any idea what could be wrong?

I have this problem only in one project. In my other projects it´s always automatically enabled.