Hi Stanley,
We regret for the inconvenience caused. I have tested this issue in v.5.1.0.51. I am afraid, I was not able to reproduce this issue. Here is my test sample
http://websamples.syncfusion.com/samples/Grid.Windows/67853/main.htmCould you please check the sample and let me know whether you are able to reproduce the issue in this sample?. It would be helpful if you provide a sample or modify the attached sample to reproduce this issue. It will help us to resolve it as early as possible.
Thanks for using Syncfusion product.
Regards,
Nagaraj