Removing boarders from frames

[jemarti]

I apologize if this is the wrong forum for this post.
I started creating a skin, and wanted to turn off the borders on most if not all frames. In my skin addon I added several lines in the onEvent function to turn off frame borders and backgrounds like this:

nUI_ActionBar:SetBackdrop ({nil});

I was able to turn off borders and backgrounds on everything except the unit frame windows. I was able to Identify a couple of hundred frames that appear to be related to unit frames with names such as:
nUI_SoloUnit_Player, nUI_SoloUnit_Player_Background, nUI_Raid20Unit_Raid1, nUI_Raid20Unit_Raid1_Background, etc., but setting SetBackdrop to nil has no affect.

Does anyone know what frames actually hold the visible boarders for the unit frames.

I've attached a screen shot of what I have so far.

Thanks,
Jim