How to read file asychronous and show progress bar??

Hello Everyone,
I am new here and this is my first post here. I made a desktop application in Adobe flex builder 3. In the application I took the path of a folder and merge all the file present in that folder in a new file. I want to show the progress bar when file merging, because it take some time to merge large number of files. I read and write files synchronously. I made the progress bar but when I called it before the file merging happening nothing happened.
How can I do this??
Thanks

if you are using desktop im going to asume you are using air. if thats the case, im not to sure however on the web what you have to do is update the progress bar with some action.
you can also consider using the  
cursorManager.setBusyCursor();
and when you are done then
cursorManager.removeBusyCursor();
let me know how you make out.
Miguel

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