Visual Studio: Is there XAML snippets support?

If you don't need parameters, then you can use the Toolbox!

Simply drag the code into the Toolbox and insert it wherever you want. This works for C# as well as for XAML.

From: http://blog.wpfwonderland.com/2012/04/16/xaml-snippets-and-visual-studio/

There is no built in support, but there is an extension to provide something similar to this.