Visual Studio window which shows list of methods
Solution 1:
There's a drop down just above the code window:
It's called Navigation bar and contains three drop downs: first drop down contains project, second type and third members (methods).
You can use the shortcut Ctrl + F2 (move focus to the project drop down) and press Tab twice (move focus to the third drop down) to focus it, down arrow will expand the list.
Full size image
Solution 2:
I found how to turn the drop down on as shown in the first answer (@ChrisF):
Go to Options->Text Editor->(your language)
and tick "Navigation bar" in the display section.