What OS? What version airport utility?
This is different in different utilities.
In v5 utility it looks like this.. and is far superior IMHO to v6 toyland version.
You can use v5 utility in Lion for which it is downloadable.. and it can be inserted with some simple manipulation into ML.
BTW use proper network names.. short, no spaces.. pure alphanumeric.
Wireless names are on the next page.