Populate a field on TAB press in ALV Grid (OOPs)

Hi Experts,
I have an ALV(oops) with cl_gui_alv_grid. I have a field MATNR as empty and when i input a value and i press TAB key d anit should go to next field (next coulmn) to fill the old material# which can be got from MARA.
I am not able to get the sy-ucomm or e_ucomm for TAB press.
Q) WHERE should i write my query logic to fill the OLD MAtnr field.
code sample : I have data change event as below.
class lcl_event_handler definition
PUBLIC SECTION .
    METHODS:
changed_data for event data_changed of cl_gui_alv_grid importing er_data_changed
                                                                           e_ucomm sender,
ENDCLASS.
in Implemntation class...
CLASS LCL_EVENT_HANDLER IMPLEMENTATION.
METHOD changed_data.
    clear:      ls_stable-row, ls_stable-col.
   loop at er_data_changed->mt_mod_cells into ls_modified.
    clear wa_outdisp.
    READ TABLE gt_outdisp INTO wa_outdisp INDEX ls_modified-row_id.
    CHECK sy-subrc EQ 0.
    lv_field = ls_modified-fieldname.
    if lv_field = 'MATNR'.
      wa_outdisp-MATNR = ls_modified-value.
      wa_outdisp-bismt = '123'.
    endif.
    MODIFY gt_outdisp FROM wa_outdisp INDEX ls_modified-row_id.
    ls_stable-row = 'X'.
    ls_stable-col = 'X'.
    grid->refresh_table_display( exporting is_stable = ls_stable ).
    endloop.
ENDMETHOD.                    "changed_data
ENDCLASS.
How can i do this?
Thanks
Dan

Max,
Yes i am using that event. I am using it before grid -> set_first_display method.
The debugger is not stopping inside the data change method when i placed a break point.
I am using refresh method also.
My code for sy-ucomm is as below.
when'NEWROW '
    when others.
      CALL METHOD cl_gui_cfw=>dispatch
        IMPORTING
          return_code = w_return_code.
      CALL METHOD grid->register_edit_event
        EXPORTING
          i_event_id = cl_gui_alv_grid=>mc_evt_modified.

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Hi,
I have an object oriented alv which is having 5 rows of data.I have a pushbutton to make any row in editable mode.My requirement is i will select any row in oops alv grid and press
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Populate a field on TAB press in ALV Grid (OOPs)

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