end-of-page event in reports

Hello expats,

I am new for sap abap and i am trying report events like TOP-OF-PAGE and END-OF-PAGE. but my program not getting trigger END-OF-PAGE event. Please any one help me.

TYPES: BEGINOF TY_MARA,

         MATNR TYPE MATNR,

         MTART TYPE MTART,

       ENDOF TY_MARA.

DATA: WA_MARA TYPE TY_MARA,

       IT_MARA TYPETABLEOF TY_MARA.

TOP-OF-PAGE.

WRITE: /2 'MATNR', 20'MTART'.

ULINE.

END-OF-PAGE.

ULINE.

WRITE: /20 '30 Records found'.

ULINE.

START-OF-SELECTION.

    SELECT MATNR MTART INTOTABLE IT_MARA FROM MARA UPTO 30 ROWS.

     LOOPAT IT_MARA INTO WA_MARA.

       WRITE: /2 WA_MARA-MATNR, 20 WA_MARA-MTART.

             ENDLOOP.

    END-OF-SELECTION.

Thanks

Raju