FileDownloader : Loading file in background

Flow
1

Hi,

In this following code, I use a FileDownloader component.

And when I click on the button, I must wait for the download to finish

How can I continue my browsing on my application without waiting the end of download ? Like an another thread ?

For information, I use java 7.

private void initialiserBoutonExport() {
		
		StreamResource ressource = new StreamResource(new StreamResource.StreamSource() {
			private static final long serialVersionUID = 1L;

			@Override
			public InputStream getStream() {
				try {
					return restituerExtraction();
				} catch (Exception e) {
					e.printStackTrace();
				}
				return null;
			}
		}, "default");
		ressource.setCacheTime(-1);
		ressource.setMIMEType("application/xls");
		fileDownloaderExtraction = new FileDownloader(ressource);
		fileDownloaderExtraction.extend(getMainView().getRechercheHeaderComponent().getExporterButton());
	}

Thanks