/**
* @return array
*/
public function allowedChildren()
{
$result = parent::allowedChildren();
// Replace 'UserSubmissionExtension' with all SiteTree classes that are using that
// extension.
foreach ($result as $i => $allowedClass) {
if ($allowedClass === 'UserSubmissionExtension') {
unset($result[$i]);
foreach (ClassInfo::subclassesFor('SiteTree') as $class) {
if ($class::has_extension('UserSubmissionExtension') && !in_array($class, $result)) {
$result[] = $class;
}
}
break;
}
}
return $result;
}
