Call Bsp page from Another Standard BSP Application.....

Dear all,

i am tring to call a POP-UP window from Standard Bsp Applicatio SRMSUS.

i had already added Button (Attachment) on the existing standard bsp page, and also get the button event in DO_HANDLE_EVENT.

on that button i want to open popup window in which my Custom BSP page should open.

how can i call Custom bsp page on this button click.

Is there any Call Url or Any method or any FM to call my BSP page.

for reference please find the screenshot below..

i have added the Attachment button here

Please Help, I am new to Bsp.

thanks,

Nilesh.