Is there a way to customize the background that highlights the selected button on the roSpringboardScreen? From http://sdkdocs.roku.com/display/sdkdoc/roAppManager both ButtonHighlightColor and ButtonNormalColor seem like they should alter the colors of the buttons, but I have not been successful in getting them to do so.
I was looking for that myself the other day. I assume you mean the long black highlight behind the selected button. I don't believe you can change the button background on any screen. It would be a nice feature to have, but I don't believe the Roku currently supports it. I think ButtonHighlightColor and ButtonNormalColor change the color of the button text (but not on the roSpringboardScreen, because that's a 'menu' button, not a regular button). For the roSpringboardScreen, you'd use the ButtonMenuHighlightText and ButtonMenuNormalText.