ComponentOne Extender Controls for ASP.NET Web Forms
Wijmo Control Toolkit Extender Controls / C1ComboBox Extender / C1ComboBoxExtender Tutorial / Step 2 of 4: Adding a C1ComboBoxExtender to the Page
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    Step 2 of 4: Adding a C1ComboBoxExtender to the Page
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    In this step, you will add a C1ComboBoxExtender control to associate with the DropDownList to create the combobox.

    1. In Source view, drag a C1ComboBoxExtender control from the Toolbox and place it under the DropDownList.
    2. Set the TargetControlID property to DropDownList1.

                <cc1:C1ComboBoxExtender ID="C1ComboBoxExtender1" runat="server" TargetControlID="DropDownList1">

     </cc1:C1ComboBoxExtender>

    Now you can begin setting properties for the C1ComboBoxExtender to format the DropDownList.