Get data from multiple checkbox

Hello,

When we use "'inputType' => 'select'," on the DCA we can use getRelated() to get data after.

if (($obj2 = $obj->getRelated('name')) !== null)
{
$obj2->value;
}

But when we use a multiple ckeckbox how to get the data after?:

'inputType' => 'checkbox',
'eval' => array('multiple' => true),

getRelated don't work…

thanks