There is a bug with the behaviors not appearing in the list, but make sure you're not just in the Scene tab when choosing them, as this is a generic menu that defaults to the Scene tab for filtering.
I haven't noticed having trouble drag-n-dopping to those fields. You're dragging the actual mono behavior that is on an object, correct? Not dragging between Scene>Project or vice versa either?
Of course, since there's no behavior, there can be no call. So be sure you are getting the behavior into the slot.