Hi Youngjin,
Thanks for the update.
We are able to reproduce the issue reported by you and the issue has been Suspected to be a defect. Please create a DT incident for your query.
You can create the DT incident from the following link.
<
http://www.syncfusion.com/account/dashboard>In the interests of maintaining confidentiality, we have a policy of not sharing patches or otherwise proprietary customer specific information in the public Forum.
Please let us know if you have any queries.
Regards,
Amsath Ali. M