VBA handle on a C# ribbon

J

jh

When opening particular workbooks I want to add buttons to a generic
company ribbon tab, that has already been written using C# and is pre-
installed . How can I get a handle on this object? I.e. with <tab
idMso="TabHome"> I can add controls to the 'Home' tab, how can this be
made to work with (something like) <tab idMso="TabMyCompany">

Many thanks.
 
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