The Seam debug page does not really allow drilling down into the values of Seam bean properties.
If you start wanting to do this then maybe look into remote debugging for your server. This will allow you to step through the executed code using your IDE. When you are doing this you can inspect variable values and even run small snippets of code to check things.
The debug page is really more about looking at what's inside a particular conversation or scope.
That's what i figured. I use IntelliJ so i already do remote debugging and i can step through fine.