Dont know why these buttons dont work (newbie)

hi this is a procedure that activates/deactivates buttons
accordingly to the record number..
but it doesnt work, does any1 know why....
sory but a newbie...
calling the procedure in
WHEN-NEW-RECORD-INSTANCE
BEGIN
BUTTON_CONTROL;
END
/*This is the Procedure*/
PROCEDURE BUTTON_CONTROL IS
BEGIN
if :system.last_record = 'TRUE' and :system.cursor_record
= '1' then
     set_item_property('button_palette.NEXT', enabled,
property_off);
     set_item_property('button_palette.PREVIOUS', enabled,
property_off);
elsif :system.last_record = 'TRUE' then
     set_item_property('button_palette.NEXT', enabled,
property_off);
     set_item_property('button_palette.PREVIOUS', enabled,
property_on);
elsif :system.cursor_record = '1' then
     set_item_property('button_palette.NEXT', enabled,
property_on);
     set_item_property('button_palette.PREVIOUS', enabled,
property_off);
else
     set_item_property('button_palette.NEXT', enabled,
property_on);
     set_item_property('button_palette.PREVIOUS', enabled,
property_on);
end if;
END;

hi master
please guid me where you define that procedure i need that
please guid me event name or sample code
thanking you

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error_catch.png ‏273 KB

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