C / C++ / MFC

BOOL CwhateverApp::InitInstance()
{
	AfxEnableControlContainer();

	// 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.

#ifdef _AFXDLL
	Enable3dControls();			// Call this when using MFC in a shared DLL
#else
	Enable3dControlsStatic();	// Call this when linking to MFC statically
#endif

/* 
        // HERE! you just should not call DoModal(). That's it! ;)

	CwhateverDlg 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;

}

CwhateverDlg dlg;
m_pMainWnd = &dlg;

BOOL CwhateverApp::InitInstance()
{
	AfxEnableControlContainer();

#ifdef _AFXDLL
	Enable3dControls();			// Call this when using MFC in a shared DLL
#else
	Enable3dControlsStatic();	// Call this when linking to MFC statically
#endif

       // These 2 lines are important! Keep them. :)
	CwhateverDlg dlg;
	m_pMainWnd = &dlg;

	// Must return true to set/keep the app active/alive! ;)
	return TRUE;

}


Remove every thing else.