Enable vertical split of the same CSHTML view file in Visual Studio 2013

In Visual Studio 2013, you can open the same C# file twice and view them vertically side-by-side by opening the C# file, selecting the menu [Window] --> [New Window] and then selecting [Window] --> [New Vertical Tab Group]. However, for *.cshtml MVC View files, this does not work. The [Window] --> [New Window] menu item is grayed out. To enable [Window] --> [New Window] menu item for *.cshtml file, you can try this registry hack.

1. Close Visual Studio 2013 if currently open.
2. Use RegEdit and go to
   [HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\12.0_Config\Languages\Language Services\HTMLX] .
3. Find "Single Code Window Only" entry. 
4. Change its value from 1 to 0.
5. Start Visual Studio.

Now you should be able to open a *.cshtml file, select [New Window] from the [Window] menu to open another editor window of the same *.cshtml file, right-click on the the new editor window's tab and select [New Vertical Tab Group] to create side-by-side editor view of the same file. Changes you make on one editor window will instantly appear on the other editor window of the same file.