I have to show a message to the user at the beginning of a backingBean 
processing and then, at a certain point of processing, clear the message from 
the backingBean.
I've tried different ways to achieve this:

-          tr:message (the message is not updated on screen)

-          tr:poll and tr:progressIndicator (is not updated and constant 
polling seems like an overkill, anyway)

-          tr:panelPopup (I'm not able to close it from the backing bean)

It looks like a trivial problem. Could someone point me to a solution?

Background:
I've written an application which allows the user to download files. When the 
user clicks the download button, then the backing bean first will decrypt and 
unzip the file (takes on large files 10 seconds an more) and then writes the 
content to the HttpServletResponse's outputStream. The browsers show the 'Save 
as' window of course not before the writing to the outputStream starts.

Regards
Roland

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