List objects and variables shows nothing in AS3?

What’s the score here? I’m used to using list variables/objects a lot from the Flash player in AS2, to make sure objects have really been removed, onEnterFrames have really been deleted etc, or even to make sure arrays are correctly populated etc, just for general debugging purposes.

Now when clicking list objects or variables in AS3, I just get Level 0, and that’s it.

How do I see a list of all objects/variables in AS3?