ComponentOne Extender Controls for ASP.NET Web Forms
Wijmo Control Toolkit Extender Controls / C1Expander Extender / C1Expander Extender Tutorial / Step 2 of 4: Adding C1Expander Extender to the Page
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    Step 2 of 4: Adding C1Expander Extender to the Page
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    In this step, you will add a C1ExpanderExtender control to associate with the Panel  to create the expanding text.

    1. In Design view, select the Panel, click the smart tag, and select Add Extender from the Panel Tasks menu.
    2. In the Extender Wizard, select C1ExpanderExtender and click OK. The TargetControlID is automatically set to Panel1. 

    <cc1:C1ExpanderExtender ID="Panel1_C1ExpanderExtender" runat="server"

            TargetControlID="Panel1">

        </cc1:C1ExpanderExtender>

    Now you can begin setting properties for the C1ExpanderExtender to format the expanding text.