I had the same problem last Christmas when I got my component cables. After an hour of searching online, I found that code on Wikipedia. Nintendo should really mention it in the box you get your cables in or in the VC game's operation's guide.
Also, once you use it once, it will fix all problems you have with other VC games (well, the games that support "component cable interlace mode" at least. Check whether it does or doesn't in the game's description on the Wii Shop).