Thank you for reporting this bug, it helps us in improving our products. I am glad to update your points for reporting this abnormal behavior of our RadComboBox control. We will investigate the cause for this issue and we will fix it in one of our future releases. You can track this progress in our Public Issue Tracking System (PITS) with Issue ID = 3296.
Please do not hesitate to contact us if you require any further information.
the Telerik team
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