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?
yadavdepAsked:
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rindiCommented:
Have you installed the VBox guest additions inside your VM?
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yadavdepAuthor Commented:
Ohh yes, I missed that.

Thanks a lot for the help
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