Can't record the Flash application via App Perfect Load Test.
There is a tutorial on the official website of the application which explains all there is to know about Flash testing.
Tutorial: http://appperfect.com/support/tutorials/web-test-flash-testing.html
There is also a tutorial regarding the record process. It's a video tutorial and it can be accessed through the following link: http://appperfect.com/products/demo/web-test/web-testing-recording-test.html