The DevMode widget serves two functions. First, it shows the current status of Dashbooard Development Mode. Second, if you click on the widget it will turn devmode on or off.
Devmode enables you to drag widgets out of the dasboard layer and onto the desktop. After devmode is enabled, you may drag a widget out of the dashboard layer by following by.
Devmode is on when the widget shows the green `On` icon you see above. If the dev mode is off you will then see a red `Off` icon instead.
