Merging shapes in Visio 2010

Is it possible in Visio 2010 to merge shapes? i.e. union, combine, etc. as detailed at http://office.microsoft.com/en-us/visio/HP010254151033.aspx

With the ribbon interface, there's obviously no Shape menu, and I have not been able to locate anything similar. Searching this forum, the internet and the built-in help does not yield any results. Is it possible this feature has been removed from the 2010 version?

Thanks.

Colin