求助！MFC CTreeCtrl如何整体移动某个项到另一个项内

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HTREEITEM hR;

void CMtapp1Dlg::OnButton1() 
{
    // TODO: Add your control notification handler code here
    HTREEITEM hRoot = m_tree.InsertItem("My Computer");
    HTREEITEM hC = m_tree.InsertItem("C:\\", hRoot);
    HTREEITEM hD1 = m_tree.InsertItem("My Documents", hC);
    HTREEITEM hCf1 = m_tree.InsertItem("doc1.doc", hC);
    HTREEITEM hCf2 = m_tree.InsertItem("contract.txt", hC);
    HTREEITEM hCf3 = m_tree.InsertItem("data.bin", hC);
    HTREEITEM hCf4 = m_tree.InsertItem("simple.c", hC);
    HTREEITEM hCf5 = m_tree.InsertItem("testpaper.docx", hD1);
    HTREEITEM hD = m_tree.InsertItem("D:\\", hRoot);
    HTREEITEM hDf1 = m_tree.InsertItem("backup.img", hD);
    HTREEITEM hDf2 = m_tree.InsertItem("pic1.bmp", hD);
    hR = m_tree.InsertItem("Recycle Bins", hRoot);
    m_btn1.EnableWindow(FALSE);
}

void CMtapp1Dlg::MoveNode(HTREEITEM hP, HTREEITEM hS)
{
    HTREEITEM h = m_tree.GetChildItem(hS);
    while (h != NULL)
    {
        HTREEITEM hc = m_tree.InsertItem(m_tree.GetItemText(h), hP);
        MoveNode(hc, h);
        h = m_tree.GetNextItem(h, TVGN_NEXT);
    }
}

void CMtapp1Dlg::OnButton2() 
{
    // TODO: Add your control notification handler code here
    HTREEITEM hsel = m_tree.GetSelectedItem();
    if (hsel != NULL && hsel != hR)
    {
        HTREEITEM h = m_tree.InsertItem(m_tree.GetItemText(hsel), hR);
        MoveNode(h, hsel);
        m_tree.DeleteItem(hsel);
    }
    m_tree.Expand(hR, TVE_EXPAND);
}