ob.mbind("C-A-Up", ob.MouseContext.Frame,
ob.MouseAction.Click, callbacks.send_to_next_desktop)
ob.mbind("C-A-Down", ob.MouseContext.Frame,
ob.MouseAction.Click, callbacks.send_to_prev_desktop)
ob.mbind("C-A-Up", ob.MouseContext.Frame,
ob.MouseAction.Click, callbacks.send_to_next_desktop)
ob.mbind("C-A-Down", ob.MouseContext.Frame,
ob.MouseAction.Click, callbacks.send_to_prev_desktop)