Hi Igor
thanks for the prompt reply..I'm trying to figure out how exactly to do
that. This is because I have the following situation and I don't know where
to apply the url coding strategy:

1. there are two pages, one is a menu and one detail page
2. menu page displays objects in a hierarchy - to drill down a category into
sub-category and so on, when you click on it.
3. the application class loads the page MenuPage as the home page.
4. the home page displays items of the top level, adding AjaxBehavior on
each item so when it is clicked, a drill-down operation is called on the
corresponding menu item on the server.
5. the drill down operation basically loads the children of that item,
recreates the menu panel on the page and adds that to the AjaxRequestTarget.
6. so now we have a brand new page content, which might have links to the
DetailPage, which is a new page and will be reloaded. if the user now clicks
on that link, he will be taken to the new page, and there begins the back
button issue. When the user comes back he sees the contents as they appeared
in step #4, that is the top level menu. Once you click on an a menu item
just to test, that's where it blows up and gives the exception. 

Now I'm having trouble figuring out which page should be applied the coding
strategy to. I am loading page A and page B both using
setResponsePage(MenuPage.class)  and setResponsePage(new DetailPage(id)).
How do I introduce urls here, can you pls help a little bit?

thanks
jeff

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