The mx:Repeater is a little bit different and an interesting one. If you look in UIComponent, there's some specific exceptions for handling Repeater. I think it's more along the lines of an earlier thread here discussing possibly providing conditionals and loops in markup.
On Feb 29, 2012, at 4:51 AM, andrei apostolache wrote: > ...redundant (mx:Repeater can easily be a list with an itemRenderer). But, as > I point in my previous mail, is quite ...