How to get Ubuntu window to fill the screen?

[kenatsun]

This is my first day using VirtualBox and Ubuntu within it (on my Windows 7 machine). All is going well, except that I need to find a way to make the Ubuntu window fill my monitor screen instead of just the center of it. It currently looks like this screen print:

FullScreen.png (33.63 KiB) Viewed 1166 times

All that gray space is wasting a lot of precious screen real estate.

Advice?

~ Thanks, Ken

[Perryg]

Install the guest additions ( in the guest )

[kenatsun]

Thanks, Perryg. It's working now. ~ Ken