Custom callout view?

[kevinelliott]

How can we customize the callout view that is displayed when you click on a pin? I would like to add an image (to the left of the title/subtitle) and some multiline information. A completely custom view would potentially be nice as well.

[markrickert]

We don't currently have support for custom callouts but I'd welcome a pull request that supports it!

Maybe this would get you started? http://stackoverflow.com/q/4712729/814123