hi,
it has been a year since i used it. not sure i remember it in details. the sfapi.swc is the lib that you have to compile with your flex into .swf file, which inturn be embedded in the .html to run on the server. if you don't compile your flex app with that lib, then none of the flex elements be exposed to the outside world for the flexselenium to communicate. that is all i can tell. it is kinds of tricky.
good luck,
charlie
Charlie Tran Java Developer
SAIC
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