Autotag?

In visual studio, when you type a method name that doesn't exist, a
little button appears and if you click it, it lets you generate the stub
for that method. 

See this screenshot of what I am trying to describe:
http://img113.imageshack.us/img113/9587/autotagscreenshotsd0.jpg

What is this called? Is this an autotag? Regardless of what it is
called, how do I create one of these?

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