Index: branches/5.1.x/core/admin_templates/js/script.js
===================================================================
diff -u -N -r14147 -r14210
--- branches/5.1.x/core/admin_templates/js/script.js	(.../script.js)	(revision 14147)
+++ branches/5.1.x/core/admin_templates/js/script.js	(.../script.js)	(revision 14210)
@@ -1785,6 +1785,28 @@
 	return getFrame('main').TB.remove();
 }
 
+function onAfterWindowClose($redirect_url, $open_new_window, $force_skip_refresh) {
+	if ($open_new_window) {
+		var $ru = $redirect_url;
+
+		// setTimeout allows to call method indirectly. Without it whole idea won't work 2nd time (try adding 2 relations one after another)
+		setTimeout(
+			function() {
+				openSelector('adm', $ru.replace('%5C', '\\') + '&merge_opener_stack=1');
+			},
+			200
+		);
+
+		return ;
+	}
+
+	window.focus();
+
+	if ( !(($force_skip_refresh === true) || (typeof $skip_refresh != 'undefined' && $skip_refresh)) ) {
+		window.location.href = $redirect_url.replace('%5C', '\\');
+	}
+}
+
 function get_control($mask, $field, $append, $prepend) {
 	$append = $append !== undefined ? '_' + $append : '';
 	$prepend = $prepend !== undefined ? $prepend + '_' : '';