MFC-ON_WM_TIMER () - Problem mit static cast

Probleme mit ON_WM_TIMER in meiner Klasse CDatabaseApplicationApp die sich CWinApp

> 1>c:\programs\databaseapplication\databaseapplication\databaseapplication.cpp(20):
> error C2440: 'static_cast' : cannot convert from 'void (__thiscall
> CDatabaseApplicationApp::* )(UINT_PTR)' to 'void (__thiscall CWnd::*
> )(UINT_PTR)' 1>          Types pointed to are unrelated; conversion
> requires reinterpret_cast, C-style cast or function-style cast

Habe ich die Funktion OnTimer:

class CLifescanDatabaseApplicationApp : public CWinApp
{
public:
    CLifescanDatabaseApplicationApp();
protected:
    CLifescanDatabaseApplicationDlg * m_ptheWindow;
//Overrides
public:
    virtual BOOL InitInstance();

//Implementation
    afx_msg void OnTimer(UINT_PTR nTimerID);
    DECLARE_MESSAGE_MAP()
};

OnTimer ist nur:

void CDatabaseApplicationApp::OnTimer(UINT_PTR nTimerID)
{
    AfxMessageBox(_T("Help"));
}

Ist der timer eingestellt mit ein definieren, an der Spitze der Quellcode-Datei:

#define ID_TIMER_DATABASEQUERY 1

sowie SetTimer definiert ist, in

BOOL CDatabaseApplicationApp::InitInstance()
{
    //InitCommonControlsEx() is required on Windows XP if an application
    //manifest specifies use of ComCtl32.dll version 6 or later to enable
    //visual styles.  Otherwise, any window creation will fail.
    INITCOMMONCONTROLSEX InitCtrls;
    InitCtrls.dwSize = sizeof(InitCtrls);
    //Set this to include all the common control classes you want to use
    //in your application.
    InitCtrls.dwICC = ICC_WIN95_CLASSES;
    InitCommonControlsEx(&InitCtrls);

    CWinApp::InitInstance();


    AfxEnableControlContainer();
AfxInitRichEdit2();
    //Create the shell manager, in case the dialog contains
    //any shell tree view or shell list view controls.
    CShellManager *pShellManager = new CShellManager;

    //Standard initialization
    //If you are not using these features and wish to reduce the size
    //of your final executable, you should remove from the following
    //the specific initialization routines you do not need
    //Change the registry key under which our settings are stored
    //TODO: You should modify this string to be something appropriate
    //such as the name of your company or organization
    SetRegistryKey(_T("Local AppWizard-Generated Applications"));



    m_ptheWindow = new CDatabaseApplicationDlg();
    m_pMainWnd = m_ptheWindow;
    if(m_ptheWindow!=nullptr)
    {
        m_ptheWindow->Create(CDatabaseApplicationDlg::IDD,CWnd::GetDesktopWindow());
        m_ptheWindow->ShowWindow(SW_SHOW);
    }
    //Delete the shell manager created above.
    if (pShellManager != NULL)
    {
        delete pShellManager;
    }

    if(!m_ptheWindow->SetTimer(ID_TIMER_DATABASEQUERY,10000,nullptr))
    {
        return false;
    }
    //Since the dialog has been closed, return FALSE so that we exit the
    // application, rather than start the application's message pump.
    return TRUE;
}

Irgendwelche Ideen, wie ich dieses problem lösen?