::SendMessage(m_hWnd, PSM_CANCELTOCLOSE, 0, 0L);
ATLASSERT(GetParent() != NULL); GetPropertySheet().CancelToClose();
	void CancelToClose()	{		ATLASSERT(::IsWindow(m_hWnd));		::SendMessage(m_hWnd, PSM_CANCELTOCLOSE, 0, 0L);	}