I have followed the instructions in this MSDN article on how to register a
form with full-trust.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ipsdk/html/ipsd
kUnderstandingFullyTrustedForms_HV01073332.asp

I used the RegForm method. The article specifies that after you register the
form as full-trust you must install it. It is not too clear, but I believe
that the RegForm generated .js file is to run the first time a user opens the
form. Well, this is not happening, I get an error stating that the form is
trying to access an external object, but no installation dialog appears as
the article stipulates.