Hi Howard,
Thank you for writing.
Please note that
RadComboBox is an obsolete control which is replaced by
RadDropDownList. The desired functionality is not supported by
RadComboBox control, but it is supported by
RadDropDownList. In order to take advantage of this functionality, please migrate your combo boxes to
RadDropDownLists.
I hope that you find this information helpful.
Best wishes,
Stefan
the Telerik team
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