Get PDF using FileDownload UI

Hi,

Any pointers to documentation which shows step by step creation of a WD application, for downloading PDF using the FileDownload UI.

I have a WD application which calls a BAPI. This BAPI returns one parameter (BIN_FILE) which is of type XSTRING. This paramter contains the PDF content. I need to use this to be downloaded to a pdf.

Can anyone guide me how to do it. I used the recent posts for this but seems to loose track somewhere.

Regards

Puneet