Hello Plamen,
The service release containing the fix for your issue is out, you can download it from: https://es.infragistics.com/Membership/Default.aspx?panel=Downloads#Downloads
I'd be glad to receive a feedback on the outcome.
I have logged this behavior with our developers in our tracking system with an issue ID of 95147, and I link it to case with number of CAS-76370-9D15K8 in our support system, which I created for you. This will ensure that you will be notified as soon as the fix is available. This development issue will be assigned to a developer to research for resolution.
If you have any further questions or concerns, please do not hesitate to ask.
Thank you attend us about that bug. It will be fixed in the next 11.1 SR.
Regards.
Plamen.