Add "Add Level Events.." missing?

Development Programming & Scripting Blueprint
1

I created a TriggerVolume and I’m now looking for the OnActerBeginOverlap option under “Add Level Events for <TriggerVolume>”. It should be in the details panels under “Blueprint” but there is no Blueprint-section at all…

This is what I have:
http://s4.postimg.org/50xg60mi5/erm.png

This is what I need (from the tutorial that I follow):
http://s30.postimg.org/jtf93cv9d/erm2.png

I’m not sure if this is the right forum section. I couldn’t find a forum section for editor-specific questions.

Update:
Of course I’m stuck on this for hours and just after I post I notice it’s been moved (I suppose) in 4.6.1 to “Scene Outliner” > Trigger Volume > [Right Click] > Add Event > OnActerBeginOverlap