How to show UserControl in ExpressionBlend 4 - silverlight-4.0

I could not understand how to Open MainPage.xaml in ExpressionBlend 4.0 to add some Controls. Nothing is enabled in ExpressionBlend.
The reason is just now I started my First application. Is there any trick? Screenshot is attached for reference.
Thanks in advance...
Ashok kumar.

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To be honest, XAML Previewer still has alot of issues with Visual Studio 2015. I'm encountering the same problem and I just followed the steps from an official Xamarin blogpost. There are workarounds shared by other developers, but it didn't work for me. See link.
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Follow the link:
https://social.msdn.microsoft.com/Forums/pt-BR/e5a74745-83a3-40e6-a558-c8aae4ac3938/form-abre-atrs-do-form-principal?forum=vsvbasicpt
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