There is such problem indeed. It seems that screen readers are not properly detecting that the focus is in RadComboBox but in its TextBox instead and they are not detecting the selected event properly. We will need some time to investigate this issue to see what exactly is causing this and how we can fix it. I have created a PITS item for the issue and you can follow its progress here
Please, excuse us for the inconvenience. We have added points to your account for the report. Don't hesitate to contact us if you have other questions.
the Telerik team
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