gui builder issues?

I've been comtemplating what issues there might be in creating a gui 
designer in XWT.

One question which I don't see an answer to, is whether there is a way 
to enumerate all widgets loaded into the app (core widgets plus any 
loaded from the xwar or dynamically at runtime).

The followup is whether it is possible to enumerate all properties, 
traps, etc., of those widgets.

Can anybody think of other introspections that would be useful for such 
an app?

Also, it would be interesting to come up with a way (similar to  
javabeans) to make widgets self-documenting.

Any thoughts?

-Tupshin