Save and restore state on a tree

Hi,
We're using a tree in a pagefragment and we want to save the state when someone change it.
We save the state on treenodeX_action with this:
tree1.saveState(getFacesContext());
And we try to restore in every page with this code:
//PRERENDER METHOD
left leftFragment = (left)getBean("left");
leftFragment.getTree1().restoreState(getFacesContext(), leftFragment.getTree1());
But we get an exception (nullpointer exception) when we use .restoreState method.
What are we doing wrong?
Thanks in advance.

is it imposible?

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Date: Sat, 12 Sep 2009 13:24:12 -0600
From: [email protected]
To: [email protected]
Subject: How Do I save and restore keywords, categories and tags in PE6?
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sanray19 wrote:
I am having great difficulty in trying to create a custom catalog using the organizer function of PE 6. Upon opening the organizer I have many photos already depicted in it. So, I highlight them all and delete them obtaining a blank screen with no photos. I then import the file containing only the custom photos I want to catalog.
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