Rollback Will Drop Created Tables And Drop Created Tables In Transaction..?

Hi folks.

Here i have small problem in transactions.I don't know how it is happaning.
Up to my knowldge if you start a transaction in side the transaction if you have DML statements
Those statements only will be effected by rollback or commit but in MS SQL SERVER 7.0 and 6.5
It is rolling back all the commands including DDL witch it shouldn't please let me know on that
If any one can help this please tell me ...........Please............
For Example
begin transaction t1
create table t1
drop table t2

then execute bellow statements
select * from t1
this query gives you table with out data

select * from t2
you will recieve an error that there is no object

but if you rollback
T1 willn't be there in the database

droped table t2 will come back please explain how it can happand.....................

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