Problem using MX listbox in MX2004

I have created a List box in MX (using flash player 6). when I publish this with flash player 7, My list box is filled with undefined values.
but If I publish using Flash Player 6, the List box works fine but I am unable to use _global commands/variables.
Note: In both publishing cases I am using as2.0.
I am not in suituation to recode all list boxes in flash 7. So, hope anoyone could help me solve this problem. Thanks!