Report Control: row number limits?

Replace this member:

void CXTPReportControl::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
 if (pScrollBar != NULL)
 {
  CWnd::OnVScroll(nSBCode, nPos, pScrollBar);
  return;
 }
 int nCurPos = m_nTopRow;

 // decide what to do for each diffrent scroll event
 switch(nSBCode)
 {
  case SB_TOP: nCurPos = 0; break;
  case SB_BOTTOM: nCurPos = GetScrollLimit(SB_VERT); break;
  case SB_LINEUP: nCurPos = max(nCurPos - 1, 0); break;
  case SB_LINEDOWN: nCurPos = min(nCurPos + 1, GetScrollLimit(SB_VERT)); break;

  case SB_PAGEUP: nCurPos = max(nCurPos - GetReportAreaRows(nCurPos, false), 0); break;
  case SB_PAGEDOWN: nCurPos = min(nCurPos + GetReportAreaRows(nCurPos, true), GetScrollLimit(SB_VERT)); break;

  case SB_THUMBTRACK:
  case SB_THUMBPOSITION:
   {
    SCROLLINFO si;
    ZeroMemory(&si, sizeof(SCROLLINFO));
    si.cbSize = sizeof(SCROLLINFO);
    si.fMask = SIF_TRACKPOS;

    if (!GetScrollInfo(SB_VERT, &si) )
     return;
    nCurPos = si.nTrackPos;
   }
   break;
 }

 SetTopRow(nCurPos);

 CWnd::OnVScroll(nSBCode, nPos, pScrollBar);
}