If RoboInfo works anything like regular RoboHelp does, you
will probably need to expand the Single Source Layouts pseudo
folder and double-click the layout to get at the properties. But
something tells me you may not see this in RoboInfo. Hopefully
there is a dialog somewhere that will list all the options
available to you. In regular RoboHelp HTML, when you add a button,
you then have to ensure you enable it in the layout properties
before it will show up in the resulting files.
Sorry I'm not much more help, but having never seen or used
RoboInfo, I'm stabbing in the dark. Hopefully fellow Community
Expert and fellow RoboHelp instructor John Daigle will pick this up
and offer more.