ajaxToolkit ComboBox filter by any part of the string

I've got a requirement to filter an ajaxToolkit ComboBox by any part of the string. For and example, if the user just types the word "America", the item for "United States of America" should be filtered.

Is it possible using ajaxToolkit ComboBox? If so please help me out.

 <ajaxToolkit:ComboBox ID="ddr_doc" AutoCompleteMode="SuggestAppend" CaseSensitive="false" RenderMode="Inline" runat="server" AppendDataBoundItems="True"
  MaxLength="1000"  >
<asp:ListItem Value="0">Select</asp:ListItem>
</ajaxToolkit:ComboBox>

Data will be bound from the DB.