focusObj = Selection.getFocus();
switch (focusObj) {
	case "_level0.text1_txt" :
		Selection.setFocus("_root.text2_txt");
		break;
	case "_level0.text2_txt" :
		Selection.setFocus("_root.text1_txt");
}

Selection.setFocus(nextFocus);

Selection.setFocus.tabIndex++;