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    <p>(If you want to change the layout of the menu, similar to how the Airport menu shows more info when you option click it, then keep reading. If you want to do something entirely different, then this answer may not be as relevant as you'd like.)</p> <p>The key is <a href="http://developer.apple.com/mac/library/documentation/cocoa/reference/ApplicationKit/Classes/NSMenuItem_Class/Reference/Reference.html#//apple_ref/doc/uid/20000265-BAJCBHBG" rel="noreferrer"><code>-[NSMenuItem setAlternate:]</code></a>. For an example, let's say we're going to build an <code>NSMenu</code> that has a <code>Do something...</code> action in it. You'd code that up as something like:</p> <pre><code>NSMenu * m = [[NSMenu alloc] init]; NSMenuItem * doSomethingPrompt = [m addItemWithTitle:@"Do something..." action:@selector(doSomethingPrompt:) keyEquivalent:@"d"]; [doSomethingPrompt setTarget:self]; [doSomethingPrompt setKeyEquivalentModifierMask:NSShiftKeyMask]; NSMenuItem * doSomething = [m addItemWithTitle:@"Do something" action:@selector(doSomething:) keyEquivalent:@"d"]; [doSomething setTarget:self]; [doSomething setKeyEquivalentModifierMask:(NSShiftKeyMask | NSAlternateKeyMask)]; [doSomething setAlternate:YES]; //do something with m </code></pre> <p>Now, you'd think that that would create a menu with two items in it: "Do something..." and "Do something", and you'd be partly right. Because we set the second menu item to be an alternate, and because both menu items have the same key equivalent (but different modifier masks), then only the first one (ie, the one that is by default <code>setAlternate:NO</code>) will show. Then when you have the menu open, if you press the modifier mask that represents the second one (ie, the option key), then the menu item will transform in real time from the first menu item to the second.</p> <p>This, for example, is how the Apple menu works. If you click once on it, you'll see a few options with ellipses after them, such as "Restart..." and "Shutdown...". The HIG specifies that if there's an ellipsis, it means that the system will prompt the user for confirmation before executing the action. However, if you press the option key (with the menu still open), you'll notice they change to "Restart" and "Shutdown". The ellipses go away, which means that if you select them while the option key is pressed down, they will execute immediately without prompting the user for confirmation.</p> <p>The same general functionality holds true for the menus in status items. You can have the expanded information be "alternate" items to the regular info that only shows up with the option key is pressed. Once you understand the basic principle, it's actually quite easy to implement without a whole lot of trickery.</p>
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    1. POHow does Apple update the Airport menu while it is open? (How to change NSMenu when it is already open)
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    1. USDave DeLong
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    1. COExtremely useful information, though not what I was going for. I'll definitely find a use for it though. I'm really after the way the menu injects the networks it finds while it is open. Thanks
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