onSubmitComplete not fired

I have this scenario I couldn't get right, so any insights are
apreciated:

A FormPanel contains a FileUpload widget, and the server returns a
downloadable content:

response.setContentType("application/x-download");
response.setHeader("Content-Disposition", "attachment; filename=" +
campaignId + ".xml");

Now, the problem is that altough the upload succedes, and the server
generated content is perfectly downloadable, the onSubmitComplete
handle is never called. This is a problem since this way one can't
clear 'Please wait' messages etc.

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