Tooltip in Treecontrol

How can i add an individual tooltip to each tree control?
It would be nice if this tooltip could be of type xtpToolTipMarkup!

Please help!

Thank you for your help but it doesn't work -> any idea?
I use toolkit version 13.4. My class is derived form CUIXTreeCtrl which is based on CXTTreeCtrl.

here is my code:

//-----------------------------------------------------------------------------
int CUIActiveUsersTreeCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)
//-----------------------------------------------------------------------------
{
    if (CUIXTreeCtrl::OnCreate(lpCreateStruct) == -1)
        return -1;

    // Create the image list used by the tree control.
    if ( !m_imageList.Create( 16, 16, ILC_COLOR24 | ILC_MASK, 1, 1 ) )
    {
        TRACE0("Failed to create image list.\n");
        return -1;
    }

    // load the tree images bitmap and add it to the image list.
    m_bitmap.LoadBitmap( IDB_IMGLIST_VIEW );
    m_imageList.Add(&m_bitmap, RGB(255,0,255));  

    // Set the image list for the tree control.
    SetImageList( &m_imageList, TVSIL_NORMAL );

    m_TTContext.SetStyle(xtpToolTipMarkup);
    m_TTContext.ShowTitleAndDescription(TRUE);
    SetToolTips(NULL);
       
    return 0;
}

BOOL CUIActiveUsersTreeCtrl::PreCreateWindow(CREATESTRUCT& cs)
{
    if ( !CUIXTreeCtrl::PreCreateWindow( cs ) )
        return FALSE;

    // Set the style for the tree control.   
    cs.style |= TVS_DISABLEDRAGDROP;   
    cs.style &= ~TVS_HASLINES;
    cs.style &= ~TVS_LINESATROOT;
    cs.style &= ~TVS_HASBUTTONS;

    // If non-xp mode, add a client edge border to the tree.
    if (!xtAfxData.bXPMode)
    {
        cs.dwExStyle |= WS_EX_CLIENTEDGE;
    }

    cs.style |= TVS_NOTOOLTIPS;

       return TRUE;
}

CString CreateMarkupTool(LPCTSTR strCaption, LPCTSTR strDesc)
{
     
    CString strHTML;
    strHTML.Format(
            _T("<StackPanel Margin='1' MaxWidth='200'>")
                _T("<TextBlock Padding='1, 3, 1, 3' FontWeight='Bold'>%s</TextBlock>")
                _T("<TextBlock Padding='9, 6, 30, 7' TextWrapping='Wrap'>%s</TextBlock>")
                _T("<Border Height='1' Background='#9ebbdd' />")
                _T("<Border Height='1' Background='White' />")               
            _T("</StackPanel>"),
        strCaption, strDesc);
   
    return strHTML;
}

INT_PTR CUIActiveUsersTreeCtrl::OnToolHitTest(CPoint point, TOOLINFO* pTI) const
{
    // check child windows first by calling CControlBar
    INT_PTR nHit = CWnd::OnToolHitTest(point, pTI);
    if (nHit != -1)
        return nHit;

    HTREEITEM hTreeItem = GetItemFromPoint(point); // this is yust a helper to get item under cursor
    if(hTreeItem)
    {
        nHit = (INT_PTR) hTreeItem;
        m_TTContext.FillInToolInfo(pTI, GetSafeHwnd(), CRect(point, CSize(100, 100) ), nHit, CreateMarkupTool(_T("XXX Test"), _T("YYY TEST2")));

        return nHit;
    }
    return -1;
}

void CUIActiveUsersTreeCtrl::RelayEvent(UINT message, WPARAM wParam, LPARAM lParam)
{
    MSG msg;
    msg.hwnd= m_hWnd;
    msg.message= message;
    msg.wParam= wParam;
    msg.lParam= lParam;
    POINT pt;
    pt.x = LOWORD (lParam);
    pt.y = HIWORD (lParam);

    ClientToScreen(&pt);

    msg.time= clock();

    msg.pt.x= pt.x;

    msg.pt.y= pt.y;

    m_TTContext.FilterToolTipMessage(this, &msg);
}

BOOL CUIActiveUsersTreeCtrl::OnWndMsg(UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
    //m_TTContext.FilterToolTipMessage(this, message, wParam, lParam);
    if (message == WM_MOUSEMOVE)
        RelayEvent(message, wParam, lParam);

    return CUIXTreeCtrl::OnWndMsg(message, wParam, lParam, pResult);
}