Why can't I get T4 templates to generate?

I am trying to create a T4 template, but I am stuck at the very first stages. I can't get any output to be generated. Right now I have the most basic template

<#@ template language="C#" #>
<开发者_开发问答;#@ output extension="cs" #>
Testing

When I save this file, nothing is generated. I then tried to right click on the .tt file, and the context menu doesn't show a "Run Custom Tool" menu item, as it does when I right click T4MVC's .tt file.

What do I do to get output to be generated?

Aha, figured it out. I had to click on my .tt file, open the properties, and set the CustomTool property to TextTemplatingFileGenerator.