This isn't the right place to ask about shared add-ins. There's a newsgroup for that
http://msdn.microsoft.com/newsgroups/default.aspx dg=microsoft.public.office.developer.com.add_ins&lang=en&cr=US
and if you search it (GoogleGroups, for example) you should find a number of discussions about issue. Two things you need to watch out for: 1. Declare the object variables for the commandbar and all buttons as member fields (not locally) so they don't get GC'd. 2. Assign a (unique) value to the TAG property of all the buttons so that they're recognized when multiple windows. See also
http://support.microsoft.com/kb/302901/en-us
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