关于Tree control节点响应函数问题

我写了一个新的CTreeControl类CNewTreeControl类
添加Tree控件消息NM_CLICK
ON_NOTIFY(NM_CLICK, IDC_TREE1, &CQQListDlg::OnNMClickTree1)

void CQQListDlg::OnTvnSelchangedTree1(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMTREEVIEW pNMTreeView = reinterpret_cast(pNMHDR);
CPoint pt = GetCurrentMessage()->pt; //获取当前鼠标点击消息的坐标点

m_TreeCtrl.ScreenToClient(&pt);   //将鼠标的屏幕坐标，转换成树形控件的客户区坐标

UINT uFlags = 0;

HTREEITEM hItem = m_TreeCtrl.HitTest(pt, &uFlags);

if ((hItem != NULL) && (TVHT_ONITEM & uFlags)
{
m_TreeCtrl.SelectItem(hItem);

CString nDat = m_TreeCtrl.GetItemText(hItem);

if(nDat == "石")
{
AfxMessageBox("石");
}
else if(nDat == "张")
{
AfxMessageBox("张");
}
}
*pResult = 0;
}

怎么添加完没有反应 求大神回答 急求~