I believe in the current version the document is straight loaded via url: e.g. viewname/docid?opendocument command
Via the form properties is said that the document should be opened with an xpage.
This we have to rewrite in the next version of Bildr to my opinion (straight open the xpage).
I am not sure if a image placeholder is used at the moment or just html is injected (computed text that displayes html as in [img src= ] etcetera..