The problem is that actually, if you open a display (a dialog), it gets the input focus. So, all you do with keyboard, mouse or joy is processed by the eventhandlers assigned to that display (if any), or, by default, by the display controls (buttons, etc). This may be reasonable, as long as the display has inpunt controls, else, moving the mouse to click a button would cause your airplane to roll and crash, for example. But in current version controls may be also readonly, and if a display has only readonly controls, there is no reason to give it the input focus. Just the very same as current HUD info, the info is there but there is no interference with the keyboard/mouse/joy.