Urgent...editable col...is not showing values....in grid...have ur points.

Hi all,
I m using an ALV grid with one column editable....but some cells of that columns are uneditable.
Now I m putting values in the editable column....my grid is interactive..now when i click on some button...to display the value of grid in list screen.....the editable column shows no values.... pleas help me...
<b>Have ur points.</b>
some code..
DATA it_fieldcat TYPE lvc_t_fcat.
DATA wa_fieldcat TYPE lvc_s_fcat.
DATA wa_celltab TYPE lvc_s_styl.
DATA it_celltab TYPE lvc_t_styl.
PERFORM display_grid.          note : - Till this it's working..
form display grid.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY_LVC'
    EXPORTING
      i_callback_program = sy-repid
      i_callback_user_command = 'UCOMM'
      i_callback_pf_status_set = 'SET_PF_STATUS'
     i_grid_title       = 'GRID DISPLAY'
      is_layout_lvc      = wa_layout
      it_fieldcat_lvc    = it_fieldcat
      it_events          = it_event
    TABLES
      t_outtab           = itab
    EXCEPTIONS
      program_error      = 1
      OTHERS             = 2.
Being an interactive grid..
form <b>UCOMM</b> is called..
i m setting breakpoints at UCOMM to see my itab...but itab is showing no values in the editable column..
I wish u understand.

this is the example for data_changed method.
i think there is no need for the method get_selected_cell too. only data_chaned serves the purpose.
**class definition and implementation
      CLASS LCL_EVENT_RECEIVER DEFINITION
CLASS LCL_EVENT_RECEIVER DEFINITION.
PUBLIC SECTION.
    METHODS HANDLE_DATA_CHANGED
    FOR EVENT DATA_CHANGED OF CL_GUI_ALV_GRID
    IMPORTING ER_DATA_CHANGED E_ONF4 E_UCOMM.
ENDCLASS.                    "cl_event_receiver DEFINITION
      CLASS LCL_EVENT_RECEIVER IMPLEMENTATION
CLASS LCL_EVENT_RECEIVER IMPLEMENTATION.
METHOD HANDLE_DATA_CHANGED.
IF OUTPUT_TYPE = DETAIL.
   PERFORM DATA_CHANGED USING ER_DATA_CHANGED E_ONF4 E_UCOMM.
ENDCLASS.
<b>in PBO</b>
**set handler to trigger the event
SET HANDLER EVENT_RECEIVER->HANDLE_DATA_CHANGED FOR GO_GRID.
**registering data_changed
CALL METHOD GO_GRID->REGISTER_EDIT_EVENT
    EXPORTING
      I_EVENT_ID = cl_gui_alv_grid=>mc_evt_modified.
CALL METHOD GO_GRID->REGISTER_EDIT_EVENT
    EXPORTING
      I_EVENT_ID = cl_gui_alv_grid=>mc_evt_enter.
<b>IN pai</b>
FORM DATA_CHANGED USING P_ER_DATA_CHANGED TYPE REF TO
CL_ALV_CHANGED_DATA_PROTOCOL P_ONF4 type C E_UCOMM TYPE SY-UCOMM.
DATA: L_VALUE TYPE LVC_VALUE,
    ls_mod_cell type lvc_s_modi.
**for getting f4 help
IF P_ONF4 NE SPACE.
    PERFORM ONF4.
ENDIF.
LOOP AT P_ER_DATA_CHANGED->MT_MOD_CELLS INTO LS_MOD_CELL.
    CALL METHOD P_ER_DATA_CHANGED->GET_CELL_VALUE
      EXPORTING
        I_ROW_ID    = LS_MOD_CELL-row_id
        I_FIELDNAME = LS_MOD_CELL-fieldname
      IMPORTING
        E_VALUE     = L_VALUE.
    CLEAR: V_FNAME.
    V_FNAME = LS_MOD_CELL-FIELDNAME.
***now with the l_value u can update the internal table.
ENDLOOP.

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