Help auto-loading a graphic all at boot

[Saint Michael]

Dear Friends
I have been unable to do something that should be very simple. I managed to
auto-login a non-root user, into the graphic environment, by adding some
information to /etc/gdm/custom.conf. But I need also to auto-launch a
graphic app, in this case Chrome, and that proves elusive . I believe that
this is a similar case to loading any graphic app into Gnome. Yes, I know
about the Gnome Preferences->StartUP Applications, but in this case, Chrome
loads but it is invisible. Does anybody have any idea how to accomplish
this simple task? I cannot believe that it would be impossible. I also
tried adding a line to rc.local, but it fails to load.