Being a strictly 2d programmer I can only guess. But perhaps you can create a transparent bitmap the size of the overhang and set that .png as the overhang. Not sure how it would be handled though. Depends on how the host screen handles alpha blends. And if I recall correctly ( I did write one component channel) there use to be some kind of horizontal line(s)
That would show depending on the screen color. It was things like that which got me interested in the 2D. Just could not get around those issues
My Channels: 2D API Framework Presentation: https://owner.roku.com/add/2M9LCVC
Updated: 11-11-2015 - Completed Keyboard interface
The Joel Channel ( Final Beta )