Configuring XP in a Domain with NT but display the machines in groups

Hello To All.

When I login in a Domain to NT, the machines with XP always display in the Domain when I see the network. This is a problem if I have a network with a 200 machines. Alls display in the same group (the Domain).

In Win 9X, Me, 2000 I can login in a Domain but see the machine in groups when I look the network icon.

Wht happend with XP. How can I login in a Domain but displays the machines in gruops when I look the network.

Thank for your help, and sorry my english.