One of the many unfinished aspects of the AutoCAD 2009 Ribbon is the lack of Express Tools content. One enterprising user has put the effort into correcting this, and has posted an Express Tools CUI replacement in this Autodesk newsgroup thread. I have not tested this myself. As usual with CUI, be paranoid. Back up everything before you touch anything.

While I wouldn’t normally suggest you do any Ribbon custom work in 2009 in its current state, it shouldn’t hurt in this case as it should be easily redoable once Autodesk has fixed up the worst of the 2009 CUI problems. Anything else you do should be considered as disposable. The problems with 2009’s CUI are so fundamental that it is quite likely a restructure will be required to fix them, either in a service pack or in 2010. That means your 2009 CUI efforts may need to be redone, just like your AutoCAD 2008 Dashboard modifications.