Hi David,
I am afraid that I am unable to reproduce the reported issue. Could you please try reproducing the issue in the below sample and send us the modified sample so that we could sort out the cause of the issue and provide you a solution.
http://help.syncfusion.com/support/GGC.Web/7.4.0.20/91520/main.htmPlease let me know if you have any concern.
Thanks and Regards,
Bharath .M