I am not sure. In viewing the XML Source of the XDP file, I can only find the single encrypted element 'guides' which must be used to help generate the flex form guide.
To clarify, these buttons, as far as I can tell are standard control buttons (save,print,email pdf and show/hide pdf) that get created when rendering an XDP form as a Form Guide rather than PDF.
An interesting additional note is I am finding that these controls don't consistently render when viewing the Form Guide in workspace.