"Inspector Section" disappears (Cubase 7.5)

I (accidentially) access a function that changes the setting in the Inspector (Inspector/Visibility) in an undesirable way. What happens then is that when I change e.g. volume or pan in a track, the features under Inspector disappears at the same time I click on the volume or pan. Instead, the “Showing/Hiding Channels” feature appears.

Why do the features (volume, pan etc.) under Inspector disappears?
How do I get back the opportunity to use “Inspector Sections”?