SWFUpload V 2.2.0 -- setButtonDisabled sometimes doesn't work

I'm occasionally running into issues setting the flash enabled/disabled state. This always occurs when I try to set the state shortly after I've created the swf object,. The error is something to the effect that the method (setButtonDisabled) is not found. If this method is called later, it always works.

I assume this has something to do with the button movie not being fully loaded immediately after creation. Is there a way to get around this limitation? For example, is there an event I can trigger on that fires when the movie is fully loaded (assuming this is my problem). Thanx -- m

EDIT: Nevermind. Needed to override swfUploadLoaded() and make the call from there.