Using Recyclebin in Oracle

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Oracle

I have used the following code to use the recyclebin utility in oracle...

create table tbl1
(
a int,
b varchar2(30)
);
insert into tbl1 values(1,'Heena');
insert into tbl1 values(2,'Jackline');
drop table tbl1;
select * from recyclebin;

The above queries dont give me any error.
But after deleting the table, my recyclebin is still empty.

I m using SQLPlus Oracle 10g...

i even tried
ALTER SYSTEM SET recyclebin=ON;

ALTER SYSTEM SET "_recyclebin" = true scope=both;

the above queries say "System altered" but... :(

Can anyone help me here ... Thnk u ...