according to this MSDN article, there should be an Application Bar template in every generated Xaml File for Windows Phone Projects:
Locate the sample Application Bar element, which is added to your page by default. It looks like the following.
I’ve created a new empty Windows Phone 8 project in Visual Studio 2012 and I’m missing the App Bar template which was visible when I developed for Windows Phone 7. Is this only deactivated or do I need to copy and paste the code snippet for the creation of an App Bar when I’m developing Windows Phone 8 projects?
I’ve found no other solution than to copy and paste the XAML code into my WP8 projects like this (code taken from this page):
Microsoft encourages users to use the localizable ApplicationBar instead it seems.