How do I enable the visual menu when changing language inputs? I saw this enabled on my friends Lion MBA, but I couldn't find a way to enable it on my Mountian Lion MBP. Anyone have any ideas?
There's probably something I'm missing, but it seems to be shown only for the shortcut for selecting the previous input source (⌘␣ by default). If the shortcut is an F-key, it is only shown if you hold the key and only for a split second.