In this step, you will add a C1MenuExtender control to associate with the Panel.

1. Click the Panel smart tag and select Add Extender from the Panel Tasks menu.
2. In the Extender Wizard, select C1MenuExtender and click OK. A C1MenuExtender control is added to the page and the TargetControlID is set to Panel1. The markup looks like this:

<cc1:C1MenuExtender ID="Panel1_C1MenuExtender" runat="server"

        TargetControlID="Panel1">

        <hideanimation>

            <animated effect="fade">

            </animated>

        </hideanimation>

        <slidinganimation easing="">

        </slidinganimation>

    </cc1:C1MenuExtender>

Now you can begin setting properties for the C1MenuExtender to format the list.