I have been searching for a sample of pure as3 project sample (using Flex Builder 3.0), for a new assignment. I have been using PureMVC multicore for my module Flex/AIR based applications, but never did a pure as3 project.
Here is the link to the beautiful tutorial by Actionscript 3.0 design patters. The source is available for view or download. The downloaded file is a Flex Builder archive and can directly be imported into Flex Builder workspace.
