SAP/ABAP: Popup radio button

SELECTION-SCREEN BEGIN OF SCREEN 1001 TITLE tit AS WINDOW.
PARAMETERS:r1 RADIOBUTTON GROUP r1,
           r2 RADIOBUTTON GROUP r1,
           r3 RADIOBUTTON GROUP r1,
           r4 RADIOBUTTON GROUP r1,
           r5 RADIOBUTTON GROUP r1.
SELECTION-SCREEN END OF SCREEN 1001.
tit = 'Set blabla...'.
 
START-OF-SELECTION.
  CALL SELECTION-SCREEN '1001' STARTING AT 15 15.