Index: branches/RC/core/admin_templates/js/jquery/thickbox/thickbox.js
===================================================================
diff -u -N -r11876 -r12009
--- branches/RC/core/admin_templates/js/jquery/thickbox/thickbox.js	(.../thickbox.js)	(revision 11876)
+++ branches/RC/core/admin_templates/js/jquery/thickbox/thickbox.js	(.../thickbox.js)	(revision 12009)
@@ -427,7 +427,8 @@
 
 TB.onDataReceived = function ($data, $params) {
 	if ( $.isFunction($params.onDataReceived) ) {
-		if (!$params.onDataReceived($data)) {
+		$data = $params.onDataReceived($data);
+		if ($data === false) {
 			// this callback even could prevent redirect action
 			// callback requested to stop processing
 			return ;