How to handle events in MFC?

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MFC

Hello Everyone,

I have a slider control which is used to control the value of the Bar chart. On moving the slider the Bar chart gets updated to new value. But I am facing one problem in the process. When the Arrow keys of keyboard are pressed continuously then bar chart takes time to update. I am not allowed to make changes in bar chart control so I have to handle the following events:
TB_LINEUP, TB_LINEDOWN, TB_TOP, TB_BOTTOM . like put some kind of timer or disable the events for some milliseconds. Please help me out.

Right now I am handling the events in switch case.

void CSensorGain::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
    // TODO: Add your message handler code here and/or call default

    CString szBuffer;
    char cBuff[20] = {0};
    int nTemp = 0;
    int nCurrentPos = 0;

    if (IDC_SENSORGAIN_GAPMODESLIDER == pScrollBar->GetDlgCtrlID())
    {
        switch (nSBCode)
        {
            case TB_LINEUP:
                nCurrentPos = m_GapModeSlider.GetPos();
                SendSensorGainCommand(nCurrentPos);                
                break;

            case TB_LINEDOWN:
                nCurrentPos = m_GapModeSlider.GetPos();
                SendSensorGainCommand(nCurrentPos);
                break;

            case TB_PAGEUP:
                nTemp = m_GapModeSlider.GetPos();
                m_GapModeSlider.SetPos(nTemp);
                break;

            case TB_PAGEDOWN:
                nTemp = m_GapModeSlider.GetPos();
                m_GapModeSlider.SetPos(nTemp);
                break;

            case TB_TOP:
                nCurrentPos = m_GapModeSlider.GetPos();
                SendSensorGainCommand(nCurrentPos);
                break;

            case TB_BOTTOM:
                nCurrentPos = m_GapModeSlider.GetPos();
                SendSensorGainCommand(nCurrentPos);
                break;

            default:
                break;
        }
        return ;
    }

    CDialogEx::OnHScroll(nSBCode, nPos, pScrollBar);
}