I can use the
To expand on the answer by Matt Schley:
Ctrl + F2 -> Tab -> then start typing and it'll sift through the functions in the file.
I know you were probably looking for something else, but this is as good as it gets for what's built into Visual Studio. Maybe there's extensions available.
This is a mapping for C#. The command name is
For C++, it's default is Ctrl + F8