Common/View/AbstractView.php
private function setClasses(array $classes)
    {
        if (!empty($classes)) {
            $this->vars['attr']['class'] = ' ' . trim(implode(' ', $classes));
        } else {
            unset($this->vars['attr']['class']);
        }
    }
private function setClasses(array $classes)
    {
        if (!empty($classes)) {
            $this->vars['attr']['class'] = ' ' . trim(implode(' ', $classes));
        } else {
            unset($this->vars['attr']['class']);
        }
    }
Sets the css classes.

@param array $classes