How to save only changed data of ALV in a local table ?

Hi everyone,
I created and alv with cl_gui_alv_grid, and I made it editable
Now I need that when I click on a button only the changed data to be saved on a local (internal) table
Is there a way I can do that ?
I tried with methods like check_changed_data() but they don't return a table like that
Regards,
Dren Selimi

ok than
class lcl_event_receiver definition.
     methods:
* Handle Data Changed
     handle_data_changed
     for event data_changed of cl_gui_alv_grid
     importing er_data_changed,
endclass.                    "lcl_event DEFINITION
class lcl_event_receiver implementation.
     method handle_data_changed.
          data: ls_good type lvc_s_modi.
          loop at er_data_changed->mt_good_cells into ls_good.
               read table gt_table into gs_table index ls_good-index. "is your changed row in ALV
                ls_good-fieldname "is your changed field
               if ls_good-fieldname eq 'MATNR'.
                    gs_table-matnr " is your changed field old value.
               endif. "i couldn't find a dynamic solution for old value
               "if you do not have so many columns in alv you can use this solution
                ls_good-value "is your changed field new value
               append these values to your changed field table.
               modify gt_table from gs_table index ls_good-index.
          endloop.
          call method g_alvgrid->refresh_table_display.
     endmethod.
endclass.

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