I've added support for 'action' and 'actionListner' to UIWidget and WidgetRenderer
WidgetRenderer queues an ActionEvent on UIWidget whenever it finds a
request-parameter named as the clientId of the nearest enclosing UIForm that
contains the clientId of this UIWidget (this is how it's specified in the spec
Queueing an ActionEvent by using dynafaces should also work.
part of the renderer, this should be done in an event-handler in glue.js.