Articulate Studio '13 SDK

Has anyone used the new SDK for Articulate Studio '13?  Does it work like the previous SDK for Articulate Studio '09?  Also in working with this new SDK for '13, is one able to customize the navigation button and the outer Articulate skin to be square (instead of rounded)?  I noted that the SDK files have the glossary, menu, notes, sidebar, and resources but not navigation button.  Please advise and thank you 

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