Check the Contacts starter solution that comes with FileMaker 12. It uses google maps and you can check to see if it behaves the way you want your map to work. If it does, you can check the design of the solution to see how it does it.
Actually I am using the contacts layouts from said solution, as well as scripts of course, in my implementation. Even in the starter solution I don't recall it working problem free. At least on the mac there's always been the known error (bug?) about resolution or something.