Dynamic selection screen with list box

REPORT  z_dynamic_screen.

TYPE-POOLS: vrm.

DATA: name TYPE vrm_id, list TYPE vrm_values, value LIKE LINE OF list.
TABLES: sscrfields.

* Selection screen
* List box
PARAMETERS: ps_parm AS LISTBOX VISIBLE LENGTH 10
                          USER-COMMAND abc.

* Radio buttons
PARAMETERS: rb1 RADIOBUTTON GROUP ab MODIF ID bl2,
            rb2 RADIOBUTTON GROUP ab MODIF ID bl2,
            rb3 RADIOBUTTON GROUP ab MODIF ID bl3.


INITIALIZATION.

* Populate list box values
  name = 'PS_PARM'.
  value-key = '1'. value-text = 'Line 1'. APPEND value TO list.
  value-key = '2'. value-text = 'Line 2'. APPEND value TO list.

AT SELECTION-SCREEN OUTPUT.

* Set list box with value
  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id     = name
      values = list.

* Control the display of screen components
  LOOP AT SCREEN.
    IF ps_parm = 1.
      IF screen-name = 'RB1' OR screen-name = 'RB2' .
        screen-invisible = 0.
      ELSEIF screen-name = 'RB3'.
        screen-invisible = 1.
      ENDIF.
      MODIFY SCREEN.
    ELSEIF ps_parm = 2.

      IF screen-name = 'RB1' OR screen-name = 'RB2' .
        screen-invisible = 1.
      ELSEIF screen-name = 'RB3'.
        screen-invisible = 0.
      ENDIF.
      MODIFY SCREEN.
    ELSEIF ps_parm = space.
      rb1 = 'X'.
      clear: rb2,rb3.
      IF screen-name = 'RB1' OR screen-name = 'RB2' OR
         screen-name = 'RB3'.

        screen-invisible = 0.
        MODIFY SCREEN.
      ENDIF.
    ENDIF.

  ENDLOOP.

AT SELECTION-SCREEN.
  IF sscrfields-ucomm = 'ABC'.

  ENDIF.

START-OF-SELECTION.
  WRITE: / 'Parameter:', ps_parm.