Push button "Select Block" on the list screen?Interactive report

Question

Hi, i am developing a plain report(Use read data & write output, not ALV).
And there was a checkbox(itab-chx) before each line of the output list.
The customer wants me to add 4 buttons on the menu bar, they are 'Delete', 'Select ALL', 'Deselect all',  <b>'Select block'</b>.
As far as i know that 'Delete' button is for the user to delete the entries which they have checked using the checkbox.
As for 'Select ALL' is that when they push this button, all the checkbox on the output list are checked.
As for 'Deselect all' is that ...all are unchecked.
<b>BUT</b> i dont have any idea on 'Select Block' function?? What it is and how to program and handling with this button???
Below is my code for those button, just dont know what 'Select block' means
at user-command.
  case sy-ucomm.
    when 'DLT'. 'Delete
         'Do delete things...
    when 'SLL'. 'Select all     
      loop at itab.
        itab-chx = 'X'.
        modify itab index sy-tabix.
      endloop.
      sy-lsind = 0.
      perform output.
    when 'DSL'. 'Deselect all
      loop at itab.
        itab-chx = ' '.
        modify itab index sy-tabix.
      endloop.
      sy-lsind = 0.
      perform output.
    when 'SBL'.  'Select block
      '???? No idea at all!!!
  endcase.
Great thanks!!! Any helps?
Hoo lala 
Message was edited by:
        Hoo lala
Message was edited by:
        Hoo lala

Answer 1

Refer this demo report, it is having 2 buttons one Call (defined in PF status) and other one PA30 one.
u have to create a PF status, and there in Application Toolbar option i have cretaed a button Named Call. like tht u can create more buttons as per ur requirement.
REPORT  ZGILL_CALLREPORT                        .
DATA: L_PERNR(20).
parameters : p_rname(20) obligatory DEFAULT 'NONE'.
INCLUDE <icon> .
selection-screen pushbutton 60(20) gocfg user-command amit.
AT SELECTION-SCREEN OUTPUT.
write icon_configuration as icon to gocfg.
concatenate gocfg 'Go to PA30' into gocfg.
AT SELECTION-SCREEN.
if sy-ucomm = 'AMIT'.
SET PARAMETER ID 'PER' FIELD '10000000'.
call transaction 'PA30'.
ENDIF.
Start-of-selection.
write: 'This Report is called by report',' ',p_rname left-justified.
set pf-status 'TEST'.
AT USER-COMMAND.
CASE SY-UCOMM.
WHEN 'CALL'.
submit zgill_it using selection-set 'TESTING_IT'
       exporting list to memory and return.
perform get_output.
WHEN '&F03'.
  LEAVE SCREEN.
WHEN '&F15'.
  LEAVE PROGRAM.
ENDCASE.
*&      Form  get_output
*       text
*  -->  p1        text
*  <--  p2        text
form get_output .
data : listobject like abaplist occurs 0.
CALL FUNCTION 'LIST_FROM_MEMORY'
  TABLES
    listobject       = listobject
* EXCEPTIONS
*   NOT_FOUND        = 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.
CALL FUNCTION 'DISPLAY_LIST'
* EXPORTING
*   FULLSCREEN                  =
*   CALLER_HANDLES_EVENTS       =
*   STARTING_X                  = 10
*   STARTING_Y                  = 10
*   ENDING_X                    = 60
*   ENDING_Y                    = 20
* IMPORTING
*   USER_COMMAND                =
  TABLES
    listobject                  = listobject
* EXCEPTIONS
*   EMPTY_LIST                  = 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.
refresh listobject.
endform.                    " get_output