Hi Dharmakasi,
Thanks for the link. I checked other system too. actually the client where I am not able to see the issue is a development sand box but in other client from development to quality and than to production the issue does exist so strange. The opoup where I am seeing dropdown list is a standard view. and the get_* method is same in all the client.
authorization is same in all the system for my userid.
thanks
prem