Selecting the data from main window to Popup window

Hi Experts,

I have requirement to do ALV to display the details from main window, in that selected row will be displayed in Pop up window.

I almost done the requirement, but i struck with, when i select the row from main window, empty table only displyaing.(the data which i select in main window is not displaying)

my two nodes are mara, and mara_det(both dictionary structure are 'MARA')

I have used Onclick event by using ALV.

please let me know the code where i need to add.

Thanks in advance

Aditya