saving HABTM from other controller

Hi,
Basically I Have a HATBM between "A" and "B" tables,
at the "A" controller, once the data for "A" has been entered I want
to save "A" and "A_B" tables .

I read the " How to add item using HABTM relation " disussion but
still cant get it done.

This is what i got so far:

// within "A" controller:

function add() {
if (!empty($this->data)) {
$BId=$this->Session->read('BId');
$this->A->create();
if ($this->A->save($this->data)) {
$lastCreated=$this->A->find('first',
array('conditions' => array('A.name' => $this->data['A']['name']),
'fields'=>'id'));
$this->set('Bid',$BId);
$this->set('Aid',$lastCreated['A']['id']);
}

// within "A" view

echo $this->Form->input('A_B.A_id', array('type'=>'hidden' , 'value'=>
$AId));
echo $this->Form->input('A_B.B_id', array('type'=>'hidden' , 'value'=>
$BId));

...

thanks

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