Thank you for writing.
Your question has already been answered in the support thread you have opened.
We kindly ask you to use just one support channel to contact us. Posting the same questions numerous times slows down our response time because we will need to review and address two or more tickets instead of one. Moreover threads are handled according to license and time of posting, so if it is an urgent problem, we suggest you use a support ticket, which would be handled before a forum thread.
I am copying the answer from the support ticket here, so the community can benefit from it:
You should set AutoCompleteSuggest helper SuggestMode property to Contains:
radDropDownList1.DropDownListElement.AutoCompleteSuggest.SuggestMode = SuggestMode.Contains;
Thank you for your understanding.
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