Missing Sound Wave selector in Dialogue Context

I’ve just noticed that the “Sound Wave” selector, is missing in UE 4.11.1 Is this a bug or there is another way to use the Dialogue Wave?

Capture from the documentation:

http://docs.unrealengine.com/latest/images/Engine/Audio/Overview/dialogueWaveDetails.jpg

Screenshot from 4.11.1

86489-dialoguecontext.jpg

Click the little triangle on the left.