Really thanks for your reply.
The code can recognize the objects i mentioned and test ran successfully....it worked fine..the problem is ,when i spy on the object, it did'nt have clickItem method, so that i can't perform that action to click on specific item i mentioned.
In our application they are using HTML select Dropdown which is not recognized, i submitted a ticket to support team, may be i can install that extension to my object mapping.
So i'm using Keys method (work around) to click on that item.
Thanks.