tree do not stay open tree collapsed after setResponsePage

[hubert_hupe]

hi folks,

i get wicket with the wicket... 
what do i have is a simple tree in page X. after click a node i do a redirect 
to pageY. so far so good. but the tree
collapsed after the redirect. it seems the tree is rebuild after the click. its 
a kind of postback behavior. 
my question is: what can i do to prevent collapsing the tree? if this is not 
possible, how can i open the old node? or how can i prevent the 
"reloading/postbacking"?

best regards
hubert

add(new LinkTree("tree", createTreeModel()) {
@Override
protected void onNodeLinkClicked(Object node, BaseTree tree, AjaxRequestTarget 
target) {
   System.out.println("test");
   System.out.println("node: " + node.toString());
   Page1 p1 = new Page1(node.toString());

   setResponsePage(p1); <--

 }
});

protected TreeModel createTreeModel() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode(new 
ModelBean("ROOT"));
...
}

i created a simple layout with div in the markup to ensure that the tree is on 
the left site and the navigated page on the right...

<div id="leftframe" style="float: left;  ">
...     wicket:id="tree"...
</div>
<div id="body">
        <wicket:child />
</div>