====== ABAP Reports ======
===== Function keys =====
[[http://abap-gallery.blogspot.fr/2007/07/add-toolbar-on-selection-screen.html|Source]]
<code abap>REPORT ZAALGAL0005 .

TABLES: sscrfields.

DATA: d_butt1(4).

PARAMETERS: p_grpa1(10) MODIF ID A,
p_grpa2(10) MODIF ID A,
p_grpb1(10) MODIF ID B.

SELECTION-SCREEN FUNCTION KEY 1.
SELECTION-SCREEN FUNCTION KEY 2.

INITIALIZATION.
MOVE 'This is button 1' TO sscrfields-functxt_01.
MOVE 'Toggle 1' TO sscrfields-functxt_02.
d_butt1 = 'NO'.

AT SELECTION-SCREEN.
IF sy-ucomm = 'FC01'.
d_butt1 = 'YES'.
sscrfields-ucomm = 'ONLI'.
ELSEIF sy-ucomm = 'FC02'.
IF sscrfields-functxt_02 = 'Toggle 1'.
sscrfields-functxt_02 = 'Toggle 2'.
ELSE.
sscrfields-functxt_02 = 'Toggle 1'.
ENDIF.
ENDIF.

START-OF-SELECTION.
WRITE d_butt1.</code>