Trade metals in TWS(IB)

Hello all!
Im using VB to request quotes for FX market. Now Im intersted in futures. How can I request quotes for GOLD using TWS activex. Please provide just a simple source code.

Many thanx!

1) you will probably need to subscribe to the exchange that provides that symbol ZG cme-group, GC ny,
- can you get the quote in the TWS? or does it say you need registration?
2) for sample code see the xls and vb samples supplied with the api.