I recently tested venky0589's MultiGroupingPanel control on Ext 3.3 beta 2 and found that despite being coded for Ext 2, the control successfully performed multiple grouping on Ext 3.3 beta 2. Thing is, the grouped elements did not expand or contract; when the user attempted to operate them, an error was generated in in file ext-all-debug.js, line 5129: "s.replace is not a function". I believe that some of the standard GridView event handlers were called despite a MultiGroupingView configuration; this error can be reproduced quite easily with Ext 3.3 beta 2, a modestly-configured Apache web server, and the code from venky0589's thread on his seminal grid control. Has anyone managed to get the MultiGroupingPanel control working with Ext 3.3 beta 2?