How to remove unnecessary blank(white) page when using FileDownload UI

Hi, all.

My env is like the following.

NW2004s SPS11.

i tried the file upload/download sample.

Uploading and Downloading Files in SAP NetWeaver 7.0

/people/bertram.ganz/blog/2007/05/25/new-web-dynpro-java-tutorials--uploading-and-downloading-files-in-sap-netweaver-70

Of course, it works well in normal situation but FileDownload shows

unnecessary behavior like the following.

- How to produce : Download file with allowSave behavior option

- Phenomena : File Download pop-up window is displayed but the

unnecessary blank(white) page also displayed and this page

persists even when the download is finished.

And is there any way to remove this unnecessary page behind the

pop-up window?

Best Regards.　

Sejoon