BOOL CCheckUPApp::InitInstance()
{
	// 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.

	CCheckUPDlg dlg;
	m_pMainWnd = &dlg;
	int nResponse = dlg.DoModal();
	if (nResponse == IDOK)
	{
		// TODO: Place code here to handle when the dialog is
		//  dismissed with OK
	}
	else if (nResponse == IDCANCEL)
	{
		// TODO: Place code here to handle when the dialog is
		//  dismissed with Cancel
	}

	// Since the dialog has been closed, return FALSE so that we exit the
	//  application, rather than start the application's message pump.
	return FALSE;
}

CDialog *m_dlg; //Гдето внутри класса CMyApp
......
m_dlg = new CMailerDlg(NULL);
m_pMainWnd = m_dlg;
m_dlg->Create(CMailerDlg::IDD);
m_dlg->ShowWindow(SW_SHOW);