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It could very well be a graphic stored in the game files. Like the game tooltip background (that is a common one for addons to use, and has just a slight bit of transparency, iirc).
/edit: and all backgrounds are textures. - what you see anyway - the frame that holds them is what is "Lua coded"
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
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