Download more files in bsp application

Hi to all,

i'm developing a new bsp  and i need to download more files;

for download file i use this method:  CALL METHOD cl_bsp_utility=>download

1.Convert the text to a text table ie Internal table with a line type char255 or some others.

2.Convert the text table into a string.

3.Convert the string to XSTRING.

4.Download that XSTRING as text file using the method

   CL_BSP_UTILITY=>download.

if I download 1 file  its all ok but     if I try to download 2 files on click button the system  always download the latest;

why?...how can I download 2 or more files on click button?

regard.

swb