VS Development Server vs Local IIS web server..help

I created a website using visual web developer express.  The page has just a button.  on click, it runs the code
SpeechRecognizer rec = new SpeechRecognizer();

which starts an instance of speech recogntion. 

This works fine when I debug with the "use Visual Studio Development Server" option with auto-assign port. 
However when I try to debug using the local IIS web server, the button shows up fine in the browser but clicking it does nothing.  no error messages, no time outs, no new instance of speech recognition.  I used the publish to website option and tried localhost and still nothing.  Not sure what to try next or how to go about debugging.  Any help would be appreciated.  Thanks.