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I don't think you can do this with iconFunction. You will probably have to create a custom item renderer.
There's a lot of info on doing this, but I'd start here:
I wonder if you can use the mouseOver event to call the iconFunction somehow, and maybe pass an additional parameter to the handler method.
I tried playing around with a sample that did that, and couldn't get it to work. Doesn't mean it can't be done, though! Maybe someone else can post some code...
Can I do something like this: (not sure what the syntax would be in the myIconFunc.