We are not aware of the observed by you issue for WPF"s RadAutoCompleteBox. However, using the provided description in the ASP.NET forum we tried to reproduce it, but it seems everything works as expected on our side - please, check the attached sample.
We have also created a video that demonstrates that. Could you please check it and let us know if we didn't miss something? Modifying, the sample in order to reproduce the issue will be of great help for our further investigation and in order to provide you with a prompt solution or some detailed technical instructions how to resolve it?
We are looking forward to hearing from you.
Regards,
Nasko
Telerik
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