Display orientation can be landscape or portrait on WP8

Both properties 
<code class='language-cs'>GraphicsDevice.PresentationParameters.DisplayOrientation</code> and
<code class='language-cs'>TouchPanel.DisplayOrientation</code> 
always return value <code class='language-cs'>Portrait</code> even if we are in landscape mode.

<code class='language-cs'>Window.CurrentOrientation</code> returns correct value.