如何在CMFCPropertyGridCtrl中插入编辑框以使用密码？

// 自定义密码属性类
class CPasswordProperty : public CMFCPropertyGridProperty
{
public:
    CPasswordProperty(const CString& strName, const CString& strPwd)
        : CMFCPropertyGridProperty(strName, (_variant_t)strPwd, _T(""))
    {
    }

    virtual void OnDrawValue(CDC* pDC, CRect rect)
    {
        // 绘制密码字符
        CString strPwd = (_variant_t)m_varValue;
        CString strDisplay;
        for (int i = 0; i < strPwd.GetLength(); i++)
        {
            strDisplay += _T("*");
        }

        CMFCPropertyGridProperty::OnDrawValue(pDC, rect, (_variant_t)strDisplay);
    }

    virtual BOOL OnEdit(LPPOINT /*lptClick*/)
    {
        // 显示密码编辑框
        CEdit* pEdit = new CEdit;
        CRect rect;
        rect.CopyRect(m_Rect);
        rect.DeflateRect(1, 1);
        pEdit->Create(ES_PASSWORD | WS_CHILD | WS_VISIBLE | WS_BORDER, rect, m_pWndList, AFX_PROPLIST_ID_INPLACE);
        pEdit->SetWindowText((_variant_t)m_varValue);

        return TRUE;
    }

    virtual void OnEndEdit()
    {
        // 保存密码值
        CEdit* pEdit = (CEdit*)m_pWndInPlace;
        CString strPwd;
        pEdit->GetWindowText(strPwd);
        m_varValue = (_variant_t)strPwd;

        CMFCPropertyGridProperty::OnEndEdit();
    }
};

// 在CMFCPropertyGridCtrl中添加密码属性
void AddPasswordProperty(CMFCPropertyGridCtrl& propGrid, const CString& strName, const CString& strPwd)
{
    CPasswordProperty* pProperty = new CPasswordProperty(strName, strPwd);
    propGrid.AddProperty(pProperty);
}

// 创建CMFCPropertyGridCtrl对象
CMFCPropertyGridCtrl propGrid;
CRect rectPropGrid;
GetClientRect(&rectPropGrid);
propGrid.Create(rectPropGrid, this, IDC_PROP_GRID);

// 添加密码属性
AddPasswordProperty(propGrid, _T("密码"), _T("********"));