WPF中WrapPanel動態添加控件導致ScrollViewer鼠標滾輪失效解決方法

 private void ScrollViewer_PreviewMouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
        {
            var eventArg = new MouseWheelEventArgs(e.MouseDevice, e.Timestamp, e.Delta);
            eventArg.RoutedEvent = UIElement.MouseWheelEvent;
            eventArg.Source = sender;
            sv_Grouper.RaiseEvent(eventArg);
        }