NSMenuItem not responding to setIndentationLevel:

If I call setIndentationLevel: on an NSMenuItem then nothing happens, if I call indentationLevel on it after I set it to 3, it returns 3 like it should. I'm adding the menu items to the Dock menu and I don't see anything changing.

NSMenuItem *menuItem = [[NSMenuItem alloc] initWithTitle: @"title" action: nil keyEquivalent: @""];
[menuItem setInde开发者_JAVA技巧ntationLevel: 3];
[dockMenu addItem: menuItem];

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I think this may be because you can't customize dock menu Items like that, but I am not sure. Maybe you should try to do this all in IB?