What is the Multiboard "skin"

I would like to alpha this out, but I cant seem to find its name. I looked through the UI folder, and I dont see anything. Also, where is the arrow (to minimize/maximize)?

Click Advanced - Game Interface, its in there.


EDIT:

Image - Multiboard Background = UI\Widgets\EscMenu\Human\editbox-background.blp
Image - Multiboard Border = UI\Widgets\EscMenu\Human\editbox-border.blp

EDIT2:

Just in case you want the same thing with Dialog boxes:

Image - Game Menu Background = UI\Widgets\EscMenu\Human\human-options-menu-background.blp
Image - Game Menu Border = UI\Widgets\EscMenu\Human\human-options-menu-border.blp

Thanks. I can now have my transparent multiboard! Now if only someone could solve my camera problem...