It is a well-known, perhaps, notorious, problem. At least 2 bug reports have been filed. Apparently the Coldusion Team has fixed it, but wishes to release it with Update 1 of Coldfusion 11.
You should consider using alternative solutions to Coldfusion's User Interfaces, cfgrid, cflayout, cfwindow, cfinput and so on. The general consensus is that they often fail and, in terms of updates, lag behind libraries like JQuery.