Currently, your project is built with NoXaml binaries (used with our implicit-styling mechanism) and this is why you are not seeing the GridView. With Q1 2013 we started shipping only NuGet packages with NoXaml binaries. The idea behind this decision was the smaller size of those assemblies and the requests received from our clients. We will add packages with Xaml binaries for the next official release - Q2 2013.
If you prefer to continue using the Xaml binaries, you can download them under Your Account. In case you are interested in using NoXaml binaries and implicit styles, please check this help article for a reference on how to use them in your project.
the Telerik team