Alv field size

Hi all
       Please help me to solve this problem.I want to display the size of the coloumn heading eqaul to the data element size in alv.I am using below code at this moment.Explain to me step by step to solve this problem.
layout-box_tabname   = 'ALV_FIELDS'.
eventcat_ln-name = 'TOP_OF_PAGE'.
eventcat_ln-form = 'TOP_OF_PAGE'.
append eventcat_ln to eventcat.
call function 'REUSE_ALV_GRID_DISPLAY'
    exporting
      i_callback_program       = sy-cprog
      i_callback_pf_status_set = 'SET_PF_STATUS'
      i_callback_user_command = 'USER_COMMAND '
      i_structure_name         = 'FIELDCAT'
      is_layout                = layout
      it_fieldcat              = fieldcat
      i_default                = 'A'
      i_save                   = 'A'
      is_variant               = dvariant
      it_events                = eventcat
    tables
      t_outtab                 = alv_fields
    exceptions
      program_error            = 1
      others                   = 2.
if sy-subrc <> 0.
    message id sy-msgid type sy-msgty number sy-msgno
            with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
endif.
Thanx in advance.
Regards,
Giri.

while appending header fields to ALV, there is a field (length) wherein U can specify the length and it will be displayed accordingly. So, u can set the data element size to this field and use it.

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