extend the web controls in c# - asp.net

I am developing the menu webpart using the asp.net Menu control in user control page for sharepoint 2010. I want to make available properties and methods of menu to developer (API). SO i need to either override all the menu control members in custom class which extends Menu. but it is not abstract control right? so how i can do this? How i can make available to developers to extend the menu control ? is i need to write extension methods for menu control ? please guide. I am using VS 2010 with 3.5 framework.

a simple google search emits this

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Is it possible to implement Panel controls in ASP.NET MVC5?

I have been tasked to create a web interface for a POS terminal. I was thinking of using Javascript to display button values on a panel. But my boss insists I use Panel Controls. Is this applicable in ASP.net MVC5, and how do I implement this?

Drag and drop controls at runtime in ASP.NET

We have requirement in our application to create template pages at run time. For this we need to have a feature like form designer in ASP.NET to be built. Facility to drag the controls from toolbox and drop in the form at runtime should be made available to the user. Solution should be in pure ASP.NET. Silverlight is not being used in the application. Please suggest a best way to achieve this requirement.
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http://jqueryui.com/draggable/

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How can I accomplish this?

how to show a sitecore treelist in an aspx as an control

There is an very cool tree list type in sitecore.
how could i use it like a control and set it in my asp.net page?
Also need to know how to set the source of that control and also need to get what user selected.
If you want the control Sitecore is using to build a custom Treelist you should consider getting a license for Telerik controls. Sitecore uses mostly Telerik controls to get the UI they have on the backend.
They use the RadTreeList for their content tree.
http://demos.telerik.com/aspnet-ajax/treelist/examples/overview/defaultcs.aspx
Any additional questiom you've asked in your question are answered on the Telerik demo environment.

Reusable asp dot net configurable menu control

I know this should ask to google :) but some how google is unable to search the control what i needed..
I want to downaload the menu custom control developed in asp.net which should be configurable with web application as per customization. like telerick controls. is there any link from which i can perform such control downalods (eaxcept telerik) ?
Where should i can add items,Edit, remove items, add sub sub items herarchically... no need to go inside the source code , just work from UI.

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