VideoSampleAccess

Adobe Air 1.0 application displays an rtmp mp4 stream from FMS3. I'm trying to capture a frame of video with BitmapData.draw and get a security sandbox violoation. I have added <VideoSampleAccess enabled=true>/</VideoSampleAccess> to my Application.xml and I've also tried setting the client property in the main.asc. Neither seem to work. (I'm able to stream the video w/o issue - just the BitmapData.draw throws and exception.)

What do I need to do to make this work?