The Instantiations Forums are one of the last artifacts of the former Instantiations that is still shared by the current Instantiations and Google. To break this linkage, and to reflect the fact that WindowBuilder is now an open source project at Eclipse.org, and GWT Designer is now embedded in the Google Plug-in for Eclipse (GPE), all new GWT Designer related traffic should be directed to the new Google Web Toolkit group.
Any questions about the WindowBuilder open source project and framework upon which GWT Designer is based (e.g., how to add widgets, extend the editor, create new properties, etc.) should be posted to the new WindowBuilder forum at Eclipse.org.
While no further posts will be accepted to this forum after today (May 27th, 2011), we do plan to make the historic content of this forum available in a read-only, searchable format going forward.