Hi Sumsar,
I do this with a filter I use - I had to create a new filter (AR Users). I only show users starting with 'AR' (AR%), and I also included the "locked" status to quickly show me which users are currenty locked. This displays with the invalid icon (a small red x on the icon). Would be nice to have a small padlock or something for this status but the red 'x' does just fine for me. Here's the WHERE clause I use in the filter :-
owner='DUMMY'
UNION
select user owner, 'USER' object_type, username object_name, decode(account_status,'LOCKED','INVALID','VALID') status
from dba_users
where username like 'AR%'
Hope this helps ....
Regards,
D.