public function beforeComponentRender()
{
parent::beforeComponentRender();
$multipart = false;
$callback = function (&$component) use(&$multipart) {
if ($component->isMultiPart()) {
$multipart = true;
}
return Component::VISITOR_CONTINUE_TRAVERSAL;
};
$this->visitChildren(FormComponent::getIdentifier(), $callback);
if ($multipart) {
$this->add(new AttributeModifier('enctype', new BasicModel('multipart/form-data')));
}
}
