code: def WheelDown(self, wheelTimes: int = 1, interval: float = 0.05, waitTime: float = OPERATION_WAIT_TIME) -> None:
          
          x, y = GetCursorPos()
          self.SetFocus()
          self.MoveCursorToMyCenter(False)
          WheelDown(wheelTimes, interval, waitTime)
          SetCursorPos(x, y)
docs: Make control have focus first, move cursor to center and mouse wheel down.
          wheelTimes: int.
          interval: float.
          waitTime: float.