public function actionDeletekpi($kpi_id, $goal_id)
 {
     $kpi = KPI::findOne($kpi_id);
     //@todo: make sure to check for a valid object/model
     if (isset($kpi)) {
         $kpi->delete($kpi_id);
     }
     Yii::$app->response->redirect(array('/site/viewgoal', 'id' => $goal_id));
 }