如何将MFC CDailog::OnTimer替换为ATL CAxDialogImpl方法？

class CMyDialog : public CAxDialogImpl<CMyDialog>
{
public:
    DECLARE_CAxDialogImpl(CMyDialog)

    CMyDialog()
    {
        m_nTimerID = 0;
    }

    UINT_PTR m_nTimerID;

    BEGIN_MSG_MAP(CMyDialog)
        MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
        MESSAGE_HANDLER(WM_TIMER, OnTimer)
    END_MSG_MAP()

    LRESULT OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
    {
        // 在这里初始化对话框

        // 启动定时器
        m_nTimerID = SetTimer(1, 1000, nullptr);

        return TRUE;
    }

    LRESULT OnTimer(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/)
    {
        if (wParam == m_nTimerID)
        {
            // 处理定时器消息
            // ...

            return 0;
        }

        return 0;
    }
};