Did Perry Como ever sing a song with a German army childrens choir?

A chap I was talking to in the pub last night came out with a strange piece of trivia. I wondered if anyone could help me prove him right or wrong. He said that Perry Como once sang a christmas song with the Das Reich Kinder Korp. Which was a children's choir in Nazi Germany. Now this caused a great deal of controversy and amusement in equal measures. Can anyone tell me if it is true or does anyone have copies of the carols? It would end a debate that could really turn nasty over one too many schnapps.