save object in Session Component

I have set up an application object to save all info in session, but I
don't know how to save with "cakephp" session.

In app_controller, i have set up like this in beforefilter() and
beforeRender() but I am not able to retrieve the informatoin when i go
to the next page. What I am doing wrong here?

beforefilter(){
if( $gwo = unserialize( $this -> Session -> read( "GWO" ) )
instanceof GWO ) ){
$this -> gwo = $gwo;
}else{
$this -> gwo = new GWO();
}
}

and

beforeRender(){
$this -> Session -> write( "GWO", serialize( $this -> gwo ) );
}

class GWO{
var $curUser;
var $curSurv;
var $curRev;
var $curEmp;
var $curDep;
var $depList;
var $surveyType;
var $curSurv_id;
}

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