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I use SecondBar to add a menu bar to an external display. I've added it to my login items, but I don't want it to open when there isn't an external display. How do I open SecondBar when a secondary monitor is connected?

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up vote 2 down vote accepted

Take a look at the free/open source app ControlPlane.

You can trigger different actions based on context-sensitive rules, including launching an app in response to connecting a display.

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Great answer and great app!! I love it!! Just as a note, it can be a bit confusing, so read the help pages. They do actually help. =D – daviesgeek Jul 21 '12 at 21:30

There is no way of automatically doing it with out modifying the operating system, as the display is managed as a core process. The best is just to put a shortcut on your desktop and open it when you are plugging in a display

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Well, it obviously isn't that hard to "modify the operating system" as you say, because ControlPlane works just fine. – daviesgeek Jul 22 '12 at 5:56

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