How to add extra screen in virtual box for windows 7.1 enterprise

I have installed windows 8.1 Enterprise on virtual box. I have two monitor connected to my pc.
I want to extend the display of my windows 8.1 on virtual box.

Till now under the setting option of Virtual box, I increased the Monitor count to 2 from 1.
But I am not able to get the second screen up under windows 8.1.

I am  not sure what I am missing here?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Have you installed the VBox guest additions inside your VM?

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
yadavdepAuthor Commented:
Ohh yes, I missed that.

Thanks a lot for the help
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.