// BeepButton.h
#pragma once

class CBeepButton : public CWindowImpl<CBeepButton>
{
public:
    BEGIN_MSG_MAP(CBeepButton)
        MSG_WM_LBUTTONDOWN(OnLButtonDown)
    END_MSG_MAP()

    void OnLButtonDown(UINT nFlags, CPoint point){
        MessageBeep(MB_ICONASTERISK);
        SetMsgHandled(FALSE);
    }
};
			

CBeepButton m_button_beep;
...

BOOL OnInitDialog(CWindow wndFocus, LPARAM lInitParam){
    ...
    ...

    m_button_beep.SubclassWindow(既存のボタンコントロールのハンドル);
}
			

// stdafx.h
#pragma once

#include <atlbase.h>
#include <atlapp.h>
extern CAppModule _Module;
#include <atlwin.h>

#include <atlcrack.h>
#include <atlmisc.h>
			

// MainDlg.h
#pragma once

class CMainDlg : public CDialogImpl<CMainDlg>
{
public:
    enum { IDD = IDD_MAINDLG };

    CBeepButton m_button_beep;

    BEGIN_MSG_MAP(CMainDlg)
        MSG_WM_INITDIALOG(OnInitDialog)
        COMMAND_ID_HANDLER_EX(IDOK, OnOK)
        COMMAND_ID_HANDLER_EX(IDCANCEL, OnCancel)
    END_MSG_MAP()

    BOOL OnInitDialog(CWindow wndFocus, LPARAM lInitParam){
        // スクリーンの中央に配置
        CenterWindow();

        // 大きいアイコン設定
        HICON hIcon = AtlLoadIconImage(IDR_MAINFRAME, LR_DEFAULTCOLOR,
            ::GetSystemMetrics(SM_CXICON), ::GetSystemMetrics(SM_CYICON));
        SetIcon(hIcon, TRUE);
        
        // 小さいアイコン設定
        HICON hIconSmall = AtlLoadIconImage(IDR_MAINFRAME, LR_DEFAULTCOLOR,
            ::GetSystemMetrics(SM_CXSMICON), ::GetSystemMetrics(SM_CYSMICON));
        SetIcon(hIconSmall, FALSE);

        // コントロールサブクラス化
        m_button_beep.SubclassWindow(GetDlgItem(IDC_BUTTON_BEEP));

        return TRUE;
    }

    void OnOK(UINT uNotifyCode, int nID, CWindow wndCtl){
        EndDialog(nID);
    }

    void OnCancel(UINT uNotifyCode, int nID, CWindow wndCtl){
        EndDialog(nID);
    }
};
			

// SampleProject.cpp
#include "stdafx.h"
#include "resource.h"
#include "BeepButton.h"
#include "MainDlg.h"

CAppModule _Module;

int WINAPI _tWinMain(HINSTANCE hInstance, 
    HINSTANCE /*hPrevInstance*/, LPTSTR /*lpstrCmdLine*/, int /*nCmdShow*/)
{
    HRESULT hRes = ::CoInitialize(NULL);
    ATLASSERT(SUCCEEDED(hRes));

    ::DefWindowProc(NULL, 0, 0, 0L);

    AtlInitCommonControls(ICC_BAR_CLASSES);

    hRes = _Module.Init(NULL, hInstance);
    ATLASSERT(SUCCEEDED(hRes));

    CMainDlg dlg;
    int nRet = (int) dlg.DoModal();

    _Module.Term();
    ::CoUninitialize();

    return nRet;
}