AFAIK, there is no built-in tool for viewing comments from XML files in the Visual Studio 2013 task list window.
But there are several third-party tools. For example, VS10x Comments Extender , which has a free version for download. I have never tried such tools myself, but you can take a look at the Video Gallery description.
There is also a message about aspx / ascx and cshtml files.
source share