CAKEPHP SELECT OPTION CLASS

Does someone know how to add class to a select option in a view file ?

I have at the moment:

echo $this->Form->input(
                'shelf_id',
                array(
                    'options' => $Shelves,
                    'label'=> 'Etagère :',
                    'default' => $Place['Place']['shelf_id'],
                    'class'=>'form-control')
            );

All my options element are like this :

<option value="1">Element</option>

But I want them to be like this :

<option value="1" class="myClass">Etagere 1</option>

Tks