/**
  * Manages all models.
  */
 public function actionAdmin($invoice_id, $invoice_number)
 {
     $model = new InvoicePayment('search');
     $model->unsetAttributes();
     // clear any default values
     if (isset($_GET['InvoicePayment'])) {
         $model->attributes = $_GET['InvoicePayment'];
     }
     $this->render('admin', array('model' => $model, 'invoice_id' => $invoice_id, 'invoice_number' => $invoice_number));
 }