I am not good with flex, so this http://www.flashguru.co.uk/bitmapdat...pt-3/#more-627
is really confusing
Does anyone know how to do this with f9 alpha?
Anyway, its sad how they make things that used to be so simple and fast so difficult...
you don't actually have to have a class. if the class name you put in the field doesn't exist flash will auto-generate the class for you (again this is all in that presentation and there are sample files to download).
When it auto-generates a class it does acually create anything on your hard drive but enabled you to use that class name along with the 'new' keyword' to create an instance of your bitmap from the library. The auto-generated class with extend BitmapData.