AutoCAD .NET :: Specifying Location Of Images For Ribbon (Relative Path)

I'm trying to specify the image source for ribbon images using relative syntax but having no luck.

If I use this:

button.LargeImage = new BitmapImage(new Uri(@"c:\folderA\folderB\image.png") );

it works just fine. But it relies on absolute syntax, which is daft since it forces the code to be installed in a specific directory (or the images).

I've tried 

button.LargeImage = new BitmapImage(new Uri(@"images\image.png", UriKind.Relative) );
and
button.LargeImage = new BitmapImage(new Uri(@"images/image.png", UriKind.Relative) ); 

and I've tried placing the images subdirectory with the png file relative to the assembly, to the project source folder and even relative to AutoCAD itself - and in none of the cases do I get an image. I'd like the images subfolder to be relative to the compiled assembly.