As I pointed out before, it’s unfortunately not possible to use Flex components as info windows for Google Maps.
Another issue is that the map is not available as a Flex component itself, therefore it’s a bit complicated to use it in Flex.
So I thought to address these issues in a little Google Maps API for Flex that you can download here under BSD license.
With openFlexInfoWindows I also added a method that allows you to use multiple Flex components as info window at once - nicely seperated in tabs.
Find an example below: