Problem with PF-STATUS in the INITIALIZATION event

Hi experts! i have this code...

TYPE-POOLS: slis.

data: w_excluding1 TYPE slis_t_extab.

INITIALIZATION.

break akramer.

CLEAR w_excluding1.

APPEND 'EJECUTAR' TO w_excluding1.

APPEND 'VISUALIZAR' TO w_excluding1.

SET PF-STATUS 'ZMMRDESP' EXCLUDING w_excluding1.

Those 2 buttons (EJECUTAR and VISUALIZAR) should disappear!!... it doesn´t happen, why?? help!!