How to get Table Of Content in document view for Xcode 6.2?

After updating Xcode to 6.2, the table of content in document viewer is missing for most of the UI classes references. Is any one else experiencing this issue? Is there any way to show the table of content in document viewer just like what it used to be?

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Solution

I had the same he same issue - table of contents pane was blank.

However, when I checked Preferences / Downloads, I saw that the Documentation objects iOS 8.2, OS X 10.10 and XCode 6.2 were all available but not yet downloaded, despite the fact that the "Check for and install updates automatically" was checked.

Once I had manually selected and finished downloaded iOS 8.2 documentation, the table of contents pane was appearing normally again.