I'm writing a script to do web testing, but it seems that during playback, onChange event of my edit boxes are not run.

I've tried doing the following,

for(i=0; i<10; i++)
edit_set("my_edit_box"&i, "ABC");
web_event("my_edit_box"&i, "change", 4, 4);
but it does not work. Any idea why and how to solve this?