BindModel on Instantiated model

i'm trying do that, but with no success... if someone can help me or just say if it is possible.

class myModel extends AppModel {

public function addmodel() {

$Model= new Model(); 

        $Model->bindModel(array(

            'HasMany' => array(

                'otherModel'

            )

                )

        );

}

}

returns this error: 

 Indirect modification of overloaded property Model::$HasMany has no effect [APP\Vendor\cakephp\cakephp\lib\Cake\Model\Model.php, line 938]

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