Custom behavior when clicking application icon in the Mac OS X dock

I am trying to modify the default behavior when clicking the icon of a running application in the dock. By default it brings the main window of the appl开发者_运维知识库ication to the foreground.

I would like to perform a custom operation when the icon is clicked.

Any idea to achieve this?

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Implement applicationShouldHandleReopen:hasVisibleWindows: in the app delegate; see the explanation there.