Custom form - document object_export functionality

[#1]

Description: Export functionality and new UI display is not currently visible for custom form object type of document.

Why is this feature important to you:  We have been notified of a new SEC requirement in which we will need to print a copy of the custom form and would like to be able to submit/present a clean document.

How would you like the feature to work : The export feature should work just as currently available with all other custom form objects.

Current Behaviour : The export feature is not currently available for the document object and thus would leave us with printing a copy of the web page. 

[#2]

@correkombol