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I see there is a "class" option for the form builder however it does not seem to be working. I have it formatted as:
$fields['website_design'] = array('type' => 'checkbox', 'options' => array('yes' => 'yes', 'no' => 'no'), 'class' => 'formtest');
Neither the label nor the checkbox (or the surrounding div) have the formtest css class set even though the above has been set.