Hi Nino,
Thanks for your response. I know the article you mention and its contents.
The problem, however, is that I don't know the names of the keys to look
for. I haven't been able to find them in the API doc of this class
(org.apache.wicket.markup.html.form.upload.FileUploadField) either.
I think I have my answer. Not the answer I was looking for but ok :-(
The problem seems to be that it is practically impossible to style an
'input type=file'. Where as with normal buttons you have complete control,
when the input type is file, the styling is fully in the hands of the
browser.