ActionScript 3.0 :: Loading Object Is Not Sufficiently Loaded

I'm working on a class to track the loading of N objects.In order to do that, I Use a class called Advenced Loader inheriting from flash.display.Loader.I want to be able to listen to the ProgressEvent.PROGRESS but instead of receiving how many bytes have been loaded so far, I want to know how many byes have been loaded since the last PROGRESS event.So, I have the bytesPerProgress property inside the AdvancedLoader class which listens to its contentLoaderInfo object to calculates the bytesPerProgress.Then, inside another class which uses the AdvencedLoader I could do that:[code]

That's where I get an error #2099. It seems that I can't access the Loader instance only until after it completed the loading proccess.What I really need here is (if I could) to change the contentInfoLoader. loader to reference to my AdvancedLoader class instead of the Loader interface which doesn't include my new bytesPerProgress (implicit getter).What I could have done instead is to listen to the PROGRESS event inside the AdvancedLoader and then dispatch new PROGRESS event from within the AdvancedLoader. That's not quite what I thought it would be like, but I can't think of anything else since the contentLoaderInfo is an implicit getter (read only).