Index: lib/redmine/menu_manager.rb
===================================================================
--- lib/redmine/menu_manager.rb	(revision 3625)
+++ lib/redmine/menu_manager.rb	(working copy)
@@ -267,6 +267,8 @@
           project.nil? ? item.url : {item.param => project}.merge(item.url)
         when Symbol
           send(item.url)
+        when Proc # added by Tide to allow passing a proc as the url
+          item.url.call(project).to_s # added by Tide to allow passing a proc as the url
         else
           item.url
         end