You don't dare close a PRV window in Sonar, because of the controller pane foolishness, so you minimize it.    Then you get a ghostly thing at the bottom, and there is no way to tell what's in the window other than opening it.    You can at least distinguish a ghostly PRV window from a ghostly EV window, if you look closely.   But: FEATURE REQUEST:  do as windows does: mouse hover shows the content!