private function AddTypeField()
{
$name = 'Type';
$value = $this->page->Exists() ? $this->page->GetType() : (string) PageType::Normal();
$field = new Select($name, $value);
$types = PageType::AllowedValues();
$ex404 = FrontendRouter::Page404($this->site);
foreach ($types as $type) {
if ($type == (string) PageType::NotFound() && $ex404 && !$ex404->Equals($this->page)) {
continue;
}
$field->AddOption($type, Trans('Core.PageForm.Type.' . ucfirst($type)));
}
$this->AddField($field);
}