SSIS and visual basic

I converted sql 2000 package to ssis. I had flat file to table and i had some activex script for formatting of columns in the dts. hence when i migrated to sql 2005 ssis those steps are converted to execute sql 2000 package task and when i try to execute the package from vba all other steps execute except these steps.

Can anybody can tell how to make this step run from VB or how to run the dtexec from VB.

thanks
Bhu