vString Canvas(vWindow win, String s) {
public vString Canvas(vWindow win, String s) {
vString Canvas(vWindow win, String s) {    if (s != null) {	if (s.equals("hidden")) {	    f.setVisible(false);	} else if (s.equals("normal")) {	    f.setVisible(true);	} else {	    return null; /*FAIL*/	}	visibility = s;    }    if (visibility == null) {	return null;    } else {	return vString.New(visibility);    }}