I'm using Visual Studio 2013 Ultimate. I've started my Windows Phone 8 app in Blend, and finished it in Visual studio.
According to this article, I need to:
- In Visual Studio, close the manifest file if it’s already open in XML code view.
- In Solution Explorer, expand the project node of the app.
- Double-click the Package.appxmanifest file.
OK, in Windows Phone application there is WMAppManifest.xml file instead of Package.appxmanifest.