class CMyReportControl : public CXTPReportControl
{
protected:
    DECLARE_MESSAGE_MAP()

    afx_msg void OnMouseMove(UINT nFlags, CPoint point);
};
.....................
BEGIN_MESSAGE_MAP(CMyReportControl, CXTPReportControl)
    //{{AFX_MSG_MAP(CMyReportControl)
    ON_WM_MOUSEMOVE()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

void CMyReportControl::OnMouseMove(UINT nFlags, CPoint point)
{
    // ..use this->HitTest(point) to determine current row, item, etc
    CXTPReportControl::OnMouseMove(nFlags, point);
}