Michelle,
Here's one way to handle it. Make the rowsourcetype Array. In the Init of teh combo put this code;
SELECT code, desc FROM codetable INTO ARRAY tmp ORDER BY code
lnRow = ALEN(Tmp,1)+1
DIMENSION Tmp(lnRow,ALEN(Tmp,2))
Tmp(lnRow,1) = ""
Tmp(lnRow,2) = "None"
THIS.Sorted = .T.
THIS.Requery()