Hello Jesus,
I have logged this issue on our Feedback Portal. You can track its progress, subscribe to status changes and add your comment to it
here. I have also updated your
Telerik Points.
To workaround this you can create a custom renderer and manually paint the annotation. The code is available in the item description (check the above link).
Should you have any other questions do not hesitate to ask.
Regards,
Dimitar
Progress Telerik