[JS CS4] ScriptUI Cancel button inoperant during process

Hi,
I made a small interface for exporting PDF. I create two buttons, one for launching the export, one to stop it.
The launch button calls the exportPDF() function. This function sets two the values of the progressbar.
The problem is that once the export is launched, the cancel button is no more cliackable. I would like my users to have the opportunity to stop the export process.
I saw this thread but can't succeed in applying it.
http://forums.adobe.com/message/1909296#1909296
TIA Loic
The script is build like this :
win = new Window(...)
+button export
+button cancel
+progressbar
button export onClick > exportPDF();
function exportPDF()
doc.export(...);
progressbar.value=...;

Hi steven and thanks a lot for input.
I was starting feeling desperate to get a hint on that topic.
I tried your lead but it didn't do it. (I can assume I misused it however)
I create the window on clicking the green button. The cancel window appears fine but I am still unable to switch the button. It's frozen like any other interactrive elements.
That's ok, I am giving up this cancel button issue. It would be nice to get it but that's ok.
For the record :
main win
green button
onClick > Make new Window with cancel button and own interactive function
exportPDF(...)
I wasn't any longer as the canceling window appears but still without interactivity.
Thanks a lot for trying to help me anyway.
Loic

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