小弟我想在对话框弹出时放置一个窗口在其上面，请教小弟我的代码错在哪里

我想在对话框弹出时放置一个窗口在其下面，请问我的代码错在哪里？
代码如下，我想把m_wndHolder放置在CAboutDlg窗口的下面，实际却发现在其上面，请问该如何修改？

C/C++ code


class CAboutDlg : public CDialog
{
public:
    CAboutDlg();

// Dialog Data
    //{{AFX_DATA(CAboutDlg)
    enum { IDD = IDD_ABOUTBOX };
    //}}AFX_DATA

    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CAboutDlg)
    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
    //}}AFX_VIRTUAL
    CWnd m_wndHolder;
// Implementation
protected:
    //{{AFX_MSG(CAboutDlg)
    virtual BOOL OnInitDialog();
    //}}AFX_MSG
    DECLARE_MESSAGE_MAP()
};


BOOL CAboutDlg::OnInitDialog() 
{
    m_wndHolder.CreateEx(WS_EX_CLIENTEDGE,
        AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW,::LoadCursor(NULL, IDC_ARROW), HBRUSH(COLOR_WINDOW+1),NULL), 
        _T("MyPopupWindow"),WS_VISIBLE ,CRect(0, 0, 400, 300),this,NULL,NULL);

    CDialog::OnInitDialog();

    int cx = GetSystemMetrics(SM_CXSCREEN);
    int cy = GetSystemMetrics(SM_CYSCREEN);
    int dx = 300;
    int dy = 200;
    m_wndHolder.SetWindowPos(this, cx-dx,cy-dy,dx,dy,SWP_NOACTIVATE|SWP_NOZORDER);
    m_wndHolder.CenterWindow(AfxGetMainWnd());
    CenterWindow(AfxGetMainWnd());
    
    return TRUE; // 除非将焦点设置到控件，否则返回 TRUE     
}

------解决方案--------------------
m_wndHolder.CreateEx（。。。，this 创建时，别将CAboutDlg
设置为m_wndHolder的父窗口即可，将this 改为null
------解决方案--------------------
m_wndHolder是about的父窗口：
void CMainDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
m_wndHolder.CreateEx(WS_EX_CLIENTEDGE,
AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW,::LoadCursor(NULL, IDC_ARROW), HBRUSH(COLOR_WINDOW+1),NULL),
_T("MyPopupWindow"),WS_VISIBLE | WS_SYSMENU ,CRect(0, 0, 400, 300),this,NULL,NULL);

int cx = GetSystemMetrics(SM_CXSCREEN);
int cy = GetSystemMetrics(SM_CYSCREEN);
int dx = 300;
int dy = 200;
m_wndHolder.SetWindowPos(this, cx-dx,cy-dy,dx,dy,SWP_SHOWWINDOW);//SWP_NOACTIVATE|SWP_NOZORDER);
m_wndHolder.CenterWindow(AfxGetMainWnd());
CenterWindow(AfxGetMainWnd());
pdlgAbout=new CAboutDlg;
pdlgAbout->Create(MAKEINTRESOURCE(IDD_ABOUTBOX),&m_wndHolder);
pdlgAbout->ShowWindow(SW_SHOW); }
else
{
CDialog::OnSysCommand(nID, lParam);
}
}

小弟我想在对话框弹出时放置一个窗口在其上面，请教小弟我的代码错在哪里

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