New Post: How do I get the HTMLRenderer control to appear in the Toolbox?

The core component of HTML Renderer - HtmlContainer is agnostic of where it is rendered so you can use it on any control.
You will have to do something similar to what HtmlLabel/HtmlPanel is doing: extend the proper WinForms control and overwrite the layout and draw methods.
It will be great if you can contribute the control to the project.