public function setAxisDisplay($AxisID, $Mode = AXIS_FORMAT_DEFAULT, $Format = null)
    {
        if (isset($this->Data["Axis"][$AxisID])) {
            $this->Data["Axis"][$AxisID]["Display"] = $Mode;
            if ($Format != null) {
                $this->Data["Axis"][$AxisID]["Format"] = $Format;
            }
        }
    }