Alv_list 2 headers problem

Question

Hi All,
I have created an ALV_List with 2 headers (columns sub columns).
e.g
    Months                 |           year
jan     feb     march    |     2012     2013
10      30     40          |      bc       ab
10      30     40          |      ad       dv
Heading one I have written in Top_of_Page event of alv_list Using Write statement so its alignment is fixed.
when I press the Sum button on the application tool bar of the report this alignment of Heading with its subheading gets changed. Any help is appreciated.
This is my output
and when I do the sum of old Acquisition by clicking on Total(Sigma) sign its alignment gets changed
I want to do the manupulations in 1st header whenever this Sum button is pressed.

Answer 1

This is my FM
in it events
wa_evt-NAME = 'TOP_OF_PAGE'.
wa_evt-FORM = 'TOP_OF_PAGE'.
APPEND wa_evt to   it_evt.
    IT_EVENTS                         = it_evt
*   I_SCREEN_START_LINE               = '2'
*   i_callback_user_command = 'USER_COMMAND'
   TABLES
     T_OUTTAB                          = GT_FINAL[]
  EXCEPTIONS
    PROGRAM_ERROR                     = 1
    OTHERS                            = 2
This is my TOP_of_PAGE subroutine.
**This top of page is for creating the 1st header as you can see its using write statement Its alignment is fixed with Header2
FORM TOP_OF_PAGE.
  FORMAT COLOR = 4 INTENSIFIED .
WRITE: / SY-ULINE(255).
WRITE: / SY-VLINE,
(78)'',
SY-VLINE,
(78) 'Network Tarrif'CENTERED ,
SY-VLINE,
(77) 'LMC'CENTERED,
SY-VLINE,
(74) 'Compression'CENTERED ,
SY-VLINE,
(74) 'Unregulated'CENTERED ,
SY-VLINE,
(79) 'Common'CENTERED ,
SY-VLINE,
(33) 'Total'CENTERED ,
SY-VLINE.
*    FORMAT COLOR = 1.
ENDFORM.
**This top of page is for creating the 1st header as you can see its using write statement Its alignment is fixed with Header2
Now when i press the Sum button in the list columns(Header2) are slightly shifted while top header(header1) is fixed and hence my alignment is getting disturbed.
hope you understood the problem now?