How do I activate full screen mode when using Skype?

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http://askubuntu.com – I'm using the version of Skype from the Ubuntu Software Centre (skype but I can't for the life of me see how to make a video call full screen. All I have is a small window, dragging to the edges of the screen doesn't 'aero-snap' it larger. Am I missing something really obvious, I can't see any full screen button, or work out a keyboard shortcut. Is it even possible to have a full screen video call? (HowTos)