File rollover in a trace

Hi, i'm doing a script to do a trace, how can i include in my script the option of "Enable File Rollover". I only see it by properties but i would like to include it in a script.
Thanks for your helpBest bet would be to let Profiler generate the script, then see how they do it. I believe all they do is to set a file size, and the next file is created when the first file gets to that size.