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Writing imperative Java code to construct a user-interface hierarchy is awkward, and it makes working with UI designers difficult and/or impossible. What we want is to provide designers (and developers) with a simple way to define the static structure of applications and widgets, without having to write code. It seems natural to define UI structure at the granularity of Composites. This will make it easy to define either entire applications declaratively, as well as simple widgets. It also provides a natural model for composing large structures from small ones, and for refactoring complex UI structures. (discussed here: http://groups.google.com/group/Google-Web-Toolkit-Contributors/browse_thread/thread/239bd6b7404f9b77/052019e8693b4ba6 )