How to do delegation on BIND server

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http://serverfault.com – continuing the last question about Windows AD + Linux BIND. I decided to create a subdamain for AD to run on. It's ad.wxxx.xxxxx. My configuration is okay, but I don't think it does the delegation job right. I have DNS and AD on the same server on xxx.xx.27.15, and the main name server for wxxx.xxxxx is at xxx.xx.26.1. The problem is that I have configurated a zone for that subdomain, and a NS record and A record for dns.ad.wxxx.xxxxx, both pointing to xxx.xx.27.15. I can do nslookup, but I can't join the AD domain with another computer. When I'm using the full ad.wxxx.xxxxx, the error mess (HowTos)