Visual Studio - Client Objects & Events drop down list missing?

I have no idea how this option got turned off but...

Showing Client Objects & Events:

Missing Client Objects & Events:

How do I turn this option back on so 开发者_运维知识库that it's showing again?

Go to Tools -> Options -> Text Editor -> All Languages -> General and make sure Navigation Bar is checked.

Remember that you should enable "View all properties" checkbox at the bottom left of the properties window, so you can edit the "text editor" settings, because is hidden by default.