Backend\Core\Engine\Form::addImage PHP Method

    public function addImage($name, $class = null, $classError = null)
    {
        $name = (string) $name;
        $class = $class !== null ? (string) $class : 'fork-form-image';
        $classError = $classError !== null ? (string) $classError : 'error';
        // add element
        $this->add(new FormImage($name, $class, $classError));
        return $this->getField($name);
    }