MFC Slider Control Message Handling

I worked with horizontal slider control in MFC. in order to receive the slider control messages,    we have to add the HSCROLL or VSCROLL message I added the following message : ON_WM_HSCROLL() added it within BEGIN_MESSAGE () macro. next I added the fn like afx_msg void OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) ; while using Slider control, the SCROLL message is posted... There are two main notification codes are available. That are           TB_THUMBTRACK //Slider movement (the user dragged the slider)           TB_THUMBPOSITION //WM_LBUTTONUP following a TB_THUMBTRACK notification message   void MFCDlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) {        CSliderCtrl * pControl = (CSliderCtrl*) pScrollBar);         switch(nSBCode)          {              case TB_THUMBTRACK://Slider movement (the user dragged the slider)               {                 break;              }                case TB_THUMBPOSITION:                  {                      //WM_LBUTTONUP following a TB_THUMBTRACK notification message                       //StopTimer();                         break;                   }          } }