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PLEASE READ SINCE DOING THIS VIDEO LIBREOFFICE 4.1 now only likes UPPERCASE and LOWERCASE to be exact as they programmed it. See Below.

Your code:
oNewFormDocument = ThisDatabaseDocument.FormDocum­ents.getbyname(sNewDocumentNam­e).open

Change to:
oNewFormDocument = ThisDataBaseDocument.FormDocum­ents.getbyname(sNewDocumentNam­e).open

Notice 'ThisDataBaseDocument' The B in base has to be UPPERCASE for the switch board to work in LibreOffice Base 4.1

As you may or may not know creating a push button to open a form in Libreoffice Base is non existent. Unlike in Access where there is a little wizard to do all the work for you. This Video shows you how to use Libreoffice Basic/Macros to force a button to open a form.

This video demonstrates a basic switch board with 3 forms.