xpanel("choose a simulation")
  xlabel("Synaptic bombardment: choose a demo")
  xbutton("Active coarse","load_file(\"demo_bombardment_active_coarse.oc\")")
  xbutton("Active precise","load_file(\"demo_bombardment_active_precise.oc\")")
  xbutton("Passive coarse","load_file(\"demo_bombardment_passive_coarse.oc\")")
  xbutton("Passive precise","load_file(\"demo_bombardment_passve_precise.oc\")")
  xbutton("Quit to start another simulation", "quit()")
xpanel()