Use an ajax rerRnder in combination with the rendered attribute on your panel which must be connected to a backing bean's boolean property, which indicates if it must be rendered or not.
Thanks a lot for your answer.
Is there a way to load a page from its uri in a component programmatically and add it to the jsf component tree using the parent/child relation between components?
you could do that directly in the JSF tree, but the nice thing of Seam (together with Facelets/JSf and Rich) is that a lot is already provided. You could add a bean with a list of
selectable-and-to-be-includedand let Ajax and Seam do the rest.
Most development/debugging time is (mis-) used by managing the JSF-tree yourself. Don't do this if not strictly necessary.
Thank you for the piece of advice !!