I'm fairly new to xcode and iPhone development and I'm wondering if it's possible to basically take your standard map callout with one line of text with a button at the far right, and double that within one callout. So it's one double-high callout bubble with two lines of text on top of each other, each one with a button at the far right of it. Practically, I would like the first one to go to a details page and the second one to offer directions to the annotation. Is there a way to make a custom callout as described without getting too complicated?
Check out the Asynchrony Solutions Blog for a callout replacement implementation, though it may be more work than you're looking to do. I don't think there's a simple easy way to do what you want.