>I was able to resolve all the errors and now everything seems to work except that the sorting arrows don't show (I see broken image icon instead).
>
>As Paul suggested I added images into the Images folder in my project. I guess they were referenced somehow differently in the cs file, need to dig back to it.
>

I downloaded the class you referenced. If you were to have used the project as an external DLL, it would load the images from the resource file. Since you're no longer doing this you need to fill in the ArrowUpImageUrl and ArrowDownImageUrl properties of the grid.