Upload control for form builder module

Does anybody have a sample project that has an upload control working successfully within the Form Builder module?
If so I would love to see how you went about making it happen. 

I have already seen the following post: http://blog.falafel.com/blogs/11-03-14/Creating_Custom_Form_Controls_in_Sitefinity_4_0.aspx
 And it looks pretty good. I just don't want to reinvent the wheel if somebody has a slick way to do it already.

Thanks
Tony