public function fileHistoryForm($request = null)
    {
        // Get ID either from posted back value, or url parameter
        if (!$request) {
            $this->jsonError(400);
            return null;
        }
        $id = $request->param('ID');
        if (!$id) {
            $this->jsonError(400);
            return null;
        }
        $versionID = $request->param('VersionID');
        if (!$versionID) {
            $this->jsonError(400);
            return null;
        }
        $form = $this->getFileHistoryForm([
            'RecordID' => $id,
            'RecordVersion' => $versionID,
        ]);
        return $form;
    }