alv blocked report with secondary list, not getting fieldname?

hi abapers,

I am working on alve blocked list report with one secondary list?

these are some code lines ,

" FORM ucommand USING pv_ucomm LIKE sy-ucomm

ps_selfield TYPE slis_selfield.

READ TABLE gt_gtd index ps_selfield-tabindex."

observe above code here i can't use set parameter id option because "gt_gtd" is with in the program.

when i double click on one record value in basic list?while debugging i am getting record value where i clicked and i am getting gt_gtd also in the "ps_selfield"

i am not getting SEL_TAB_FIELD,FIELDNAME contents in to 'ps_selfield'?

thank you in advance.

Edited by: new one to xi on Nov 11, 2010 3:12 PM

Edited by: new one to xi on Nov 11, 2010 3:15 PM

Edited by: new one to xi on Nov 11, 2010 4:55 PM