Signal2Noise
Headphoneus Supremus
Thats what it should do. It doesn't prompt me with the list of options. It just says 'Charging'. When you pull the top drop down menu no options are there.
Try turning the DX200 off then on again while it's cabled in. Then ensure the lock screen is displayed before swiping down from the top to get the option in the notification area. Remember, it'll say USB Charging and underneath in very small text "click here for more options" or something to that effect. Occasionally this happens to mine as well.