Changing the target structure for an Android project in Visual Studio gives me less opportunity than using Xamarin Studio to edit the same project.
Visual studio
Xamarin studio
How to add a new API, for example 18 or 21, which is not in the drop-down list of available frameworks in Visual Studio?
Open the project file (.proj) in a text editor and edit it directly. Find this:
<TargetFrameworkVersion>v4.2</TargetFrameworkVersion>