That's a basic use case we all have to preserve our app's layout.
Yes, put together a quick start and share it with us as there must be something 
else you're doing wrong.

Have a great day,
    Paul Bors

On Jul 8, 2013, at 3:10 AM, fan wang <xingfan_w...@live.cn> wrote:

> in fact i have a main page and other pages extends this page.when i login in
> this page first time ,its work, but when i close the page and login again
> ,then throw the exception..
> 
> should i show some code of java or html?
> 
> 
> 
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