public void SetDrawingEnabled(bool enabled)
            {
                if (m_IsDrawingEnabled == enabled)
                {
                    return;
                }

                m_IsDrawingEnabled = enabled;

                if (!enabled && m_Drawing != null)
                {
                    m_Drawing.Clear();
                }

                if (enabled && m_Message != null)
                {
                    Redraw();
                }
            }