Okay, that's clear. But how do I change the background color of the tk2dCamera that I'm using? In your tutorials you state clearly that you need to remove the default (3D) camera and use the tk2dCamera instead. And with that one not having a backgroundColor property I'm wondering how to set it.
I did use camera.BackgroundColor=Color.blue, and the camera (when I added it) did change to blue, but as said above, it's not showing up on the tk2dCamera.