/**
     * Manages all models.
     */
    public function actionAdmin()
    {
        $model = new Productstockhistory( 'search' );
        $model->unsetAttributes();  // clear any default values
        if ( isset( $_GET['Productstockhistory'] ) )
            $model->attributes = $_GET['Productstockhistory'];

        $this->render( 'admin', array(
            'model' => $model,
        ) );
    }