Hi NGP,
Thanks for your interest in Syncfusion Products.
I am not able to see this behavior here, I got this working fine in the below sample without any problem.
Here is the sample download link
http://websamples.syncfusion.com/samples/Grid.Windows/F65874/main.htmPlease refer the above sample and let me know if this helps.
Have a nice time.
Regards,
Rajagopal