I am afraid that I am not able to understand the exact issue from the provided image. It would be really helpful if you describe the exact behavior you want to achieve / avoid so we could help you in doing it. It would be great if you can also provide the current configuration of the control.
Regards,
Vessy
Telerik
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.