diff --git a/javascript/TreeDropdownField.js b/javascript/TreeDropdownField.js
index b6faeb823..c0e452a8c 100644
--- a/javascript/TreeDropdownField.js
+++ b/javascript/TreeDropdownField.js
@@ -173,7 +173,11 @@
 			},
 			setValue: function(val) {
 				this.data('metadata', $.extend(this.data('metadata'), {id: val}));
-				this.find(':input:hidden').val(val).trigger('change');
+				this.find(':input:hidden').val(val)
+					// Trigger synthetic event so subscribers can workaround the IE8 problem with 'change' events
+					// not propagating on hidden inputs. 'change' is still triggered for backwards compatiblity.
+					.trigger('valueupdated')
+					.trigger('change');
 			},
 			getValue: function() {
 				return this.find(':input:hidden').val();