Add toolbar button on selection screen

We can add new toolbar (maximal 5) in ABAP report to make program more interactive to user on selection screen.

Do following step.

1. Declare work area sscrfields.

TABLES: sscrfields.

2. Define text displayed in button in initialization event.

INITIALIZATION.
MOVE 'This is button 1' TO sscrfields-functxt_0n." n = 1 up to 5

3. Activate toolbar in selection screen.

SELECTION-SCREEN FUNCTION KEY n.

4. Check user command in AT selection screen

AT SELECTION-SCREEN.
IF sy-ucomm = 'FC0n'." n = 1 up to 5
....
ENDIF.

This is complete sample:

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.