From 3bbac90b2a0710a1e0a5107b335792edb8d359da Mon Sep 17 00:00:00 2001
From: Tim Hunt <T.J.Hunt@open.ac.uk>
Date: Wed, 1 Feb 2012 12:17:31 +0000
Subject: [PATCH] MDL-31469 formslib: fix invalid for="" attributes on optional
 dates

---
 lib/pear/HTML/QuickForm/checkbox.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/pear/HTML/QuickForm/checkbox.php b/lib/pear/HTML/QuickForm/checkbox.php
index 8b79c123fa3..100f8e73417 100644
--- a/lib/pear/HTML/QuickForm/checkbox.php
+++ b/lib/pear/HTML/QuickForm/checkbox.php
@@ -113,6 +113,7 @@ class HTML_QuickForm_checkbox extends HTML_QuickForm_input
      */
     function toHtml()
     {
+        $this->_generateId(); // Seems to be necessary when this is used in a group.
         if (0 == strlen($this->_text)) {
             $label = '';
         } elseif ($this->_flagFrozen) {