When you are designing new apps, you will want to make sure they can be viewed across various orientations and states. For a detailed discussion about design considerations for view states, orientations, and resolutions in Windows 8 be sure to read Scaling to different screens on the Building Windows 8 blog.
The two orientations are portrait and landscape:
The view states are:
You can also learn more about Supporting multiple views by reading the detailed document on the Windows Developer Center.
When you are building your apps, you are likely to be using Blend on a laptop or a monitor whose orientation is in Landscape. What you need is a way to design your application inside Blend while simulating the various views states and orientations at design-time.
Views inside the Platform Panel
To help you design applications that take advantage of view states and orientations, Blend enables you to select different preview views in the Platform panel.
The Views section contains four buttons, and these four buttons correspond to the view states and orientations that your application can find itself in.
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