Field name of column to be captured after click using Hotspot in block ALV

Dear All ,
A block list ALV Report has been designed using ' RESUSE_ALV_BLOCK_LIST_APPEND' . On a particular cell of the ALV List another screen comes up which gives details of that particular cell by fetching data from a particular Ztable .In the where clause I have already got the parameter which depends on the row no. Row no is being captured by using a structure SELFIELD type SLIS_SELFIELD which gives Row no in the field TABINDEX but the FIELDNAME field is blank .My Column no is a particular date spread across the month which i have to give in where clause .
Further DEBUGGING has given these results . Just after double click on cell a particular program SAPLKKBL opens up and in that perform USER_COMMAND_NEW comes up which has a perform by the name of SELFIELD_GET . In it the field name is captured in the structure ls_selfield .But how to get that particular field name my main program from that standard coding .
Plz help .
Regards,
Bharti Jain

Check this ( i have created a prog )
i am writing code:
*declaration of internal tables
DATA I_MAKT TYPE TABLE OF MAKT WITH HEADER LINE.
DATA IT_FCAT TYPE SLIS_T_FIELDCAT_ALV.
DATA IT_LAYOUT TYPE SLIS_LAYOUT_ALV.
DATA IT_EVENT TYPE SLIS_T_EVENT.
DATA WA_EVENT LIKE LINE OF IT_EVENT.
*query
START-OF-SELECTION.
SELECT * FROM MAKT INTO TABLE I_MAKT UP TO 70 ROWS.
*function module to get field catalogue
CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
EXPORTING
*     I_PROGRAM_NAME               =
*     I_INTERNAL_TABNAME           =
     I_STRUCTURE_NAME             = 'MAKT'
    CHANGING
      CT_FIELDCAT                  = IT_FCAT
*initial function module you must use to use event user command and pf status (custom pf).
CALL FUNCTION 'REUSE_ALV_BLOCK_LIST_INIT'    <----- add this FM to your code
    EXPORTING
      I_CALLBACK_PROGRAM       = SY-CPROG
*     I_CALLBACK_PF_STATUS_SET = 'SET_STATUS'
      I_CALLBACK_USER_COMMAND = 'USER_COMMAND'
      IT_EXCLUDING             = IT_EXCLUDING.
CALL FUNCTION 'REUSE_ALV_EVENTS_GET'
   EXPORTING
     I_LIST_TYPE           = 2
IMPORTING
     ET_EVENTS             = IT_EVENT[]
*modify event table for top of page form.
READ TABLE IT_EVENT INTO WA_EVENT WITH KEY NAME = 'TOP_OF_PAGE'.
WA_EVENT-FORM = 'TOP_OF_PAGE'.
MODIFY IT_EVENT FROM WA_EVENT INDEX SY-TABIX.
CLEAR WA_EVENT.
CALL FUNCTION 'REUSE_ALV_BLOCK_LIST_APPEND'
    EXPORTING
      IS_LAYOUT                        = IT_LAYOUT
      IT_FIELDCAT                      = IT_FCAT
      I_TABNAME                        = 'MAKT'
      IT_EVENTS                        = IT_EVENT[]
    TABLES
      T_OUTTAB                         = I_MAKT
*at last use this FM to display data
CALL FUNCTION 'REUSE_ALV_BLOCK_LIST_DISPLAY'
FORM USER_COMMAND USING R_UCOMM TYPE SY-UCOMM SELFIELD
              TYPE SLIS_SELFIELD.
BREAK-POINT.
MESSAGE 'user command triggered' TYPE 'I'.
ENDFORM.
FORM TOP_OF_PAGE.
BREAK-POINT.
WRITE 'top of pageeeeeee.' COLOR 5 HOTSPOT.
ENDFORM.
<removed by moderator>
Edited by: Thomas Zloch on Feb 21, 2012

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