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?

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

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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.