Latest WICD stable version. 1.7.0 is nearly 2 years old and known for its incompatibility with Python 2.7 There is a one year old beta version which behaves differently but still doesn't work at least on TC.
There is WICD version in TC3 repo depending on Python 2.6 but pygtk, pygobject for Python 2.6 are not available in TC4 repo, so you can't use it.
As WICD seems to be unmaintained by its author and I have no time to hunt for strange bugs, forget it in the TC4 repo. Also, while it was nice to have in the past, it is heavy on dependencies. You can use Robert's wifi.tcz instead.
All together I drop WICD and do not waste time till new official stable version available. If anyone can get it run with Python 2.7 on TC4 he/she is welcome.