You can easily register the Wijmo Open for Juice UI assembly and attach an extender control to an existing control in your project all via the  source markup.  To do so, follow these steps:

1. Create a new ASP.NET Web application.
2. Select Project | Manage NuGet Packages.
3. In the Search Online text box, enter Juice.
4. Click Install next to Juice UI and then click Install next to Wijmo Open for Juice UI. Note that you must accept the ComponentOne license in order to install Wijmo Open for Juice UI. References to the Juice UI and Wijmo Open for Juice UI assemblies will be added to your project.

   When you install Wijmo Open for Juice UI to your project, the Web.config file automatically adds references to the C1.Web.Wijmo.Open.Juice.4 assembly and adds TagPrefix="cc1" for each of the extender controls, so you do not need to manually register the assembly in the source markup at the top of the .aspx page. If you manually add a reference to the assembly, you must register the assembly at the top of the source page, similar to the following:

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   <%@ Register Assembly="C1.Web.Wijmo.Open.Juice.4" Namespace="C1.Web.Wijmo.Juice.WijAccordion" TagPrefix="cc1" %>

5. Click the Source tab on your .aspx page.
6. Add the extender control and assign it to a control on the page using markup similar to the following:

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   <cc1:WijAccordion ID="Panel1_WijAccordion" runat="server" TargetControlID="Panel1"> </cc1:WijAccordion>