Session->GetVariable('SessionPostBackKey', 'string')) { $ExtensionForm = $Context->ObjectFactory->CreateControl($Context, 'ExtensionForm'); if ($ExtensionForm->SwitchExtension($ExtensionKey)) { echo $ExtensionKey; } else { $Context->WarningCollector->WritePlain(); } } else { echo $Context->GetDefinition('ErrPostBackKeyInvalid'); } $Context->Unload(); ?>