/*
 * The following code destroies all resource used by the main window
 * and then destroies the main window itself.
 */
        case MSG_CLOSE:
            /* Destroy the resource used by the main window. */
            DestroyLogFont (logfont1);
            DestroyLogFont (logfont2);
            DestroyLogFont (logfont3);

            /* Destroy the child windows. */
            DestroyWindow(hWndButton);
            DestroyWindow(hWndEdit);

            /* Destroy the main window. */
            DestroyMainWindow (hWnd);

            /* Send a MSG_QUIT message to quit the message loop. */
            PostQuitMessage(hWnd);
            return 0;