Hi Stephen,
You have followed the right method itself.However there seems to be a bug with this version.We have reproduced the issue and have logged a high priority bug report regarding this.You can track the progress of bug fix through the below given link.
http://www.syncfusion.com/support/issues/tools/Default.aspx?ToDo=view&questId=2815Thanks for choosing Syncfusion products.
Regards,
Anu.