model findById reads no data

cakephp version 1.2.6

i have model Document hasMany Page
i have a controller called document_page_controller.php
(pages_controller does already exists!)

when i call the action show everything is fine i get an array with
$data['Page'] and $data['Document'];

function show($id)
{
$data = $this->Page->findById($id);
$this->set("data", $data);
}

when i call edit function everything works fine too. but after i call
$this->Page->save($this->data) i want to go back to show function.

$this->Session->setFlash("Saved", "flash_success");
$this->show($pageId);
$this->render("show");

but now i dont have any data in $data in show view. i see Page and
Document array but all fields have a NULL value. the fields i have
edited have the right value. i need the [Document][id] in show
function

i have already tried to call $this->Page->create(); $this->Page->id =
null and so on. nothing works.
when i open the show view again directly without the edit everything
is working fine again.

thanks for your help!

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