docs: def gotoNext( self ):
          """
          Goes to the next date based on the current mode and date.
          """
          scene = self.scene()
          date  = scene.currentDate()
          
          # go forward a day
          if ( scene.currentMode() == scene.Mode.Day ):
              scene.setCurrentDate(date.addDays(1))
          
          # go forward a week
          elif ( scene.currentMode() == scene.Mode.Week ):
              scene.setCurrentDate(date.addDays(7))
          
          # go forward a month
          elif ( scene.currentMode() == scene.Mode.Month ):
              scene.setCurrentDate(date.addMonths(1))