Change the background on Windows Phone 8 - windows-phone-8

I am trying to change background image on Windows Phone 8 project. And I am writing the following code in MainPage.xaml:
<phone:Panorama.Background>
<ImageBrush ImageSource="/PanoramaApp1;component/Assets/arka.png"/>
</phone:Panorama.Background>
But not changing the when I run.
What is my problem?
Thanks in advance.
(Sorry my language.)

Try setting the Layoutroot background to transparent.
And
<phone:Panorama.Background>
<ImageBrush ImageSource="/Assets/Tiles/arka.png"/>
</phone:Panorama.Background>

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