load_file("nrngui.hoc")
objref box
box = new VBox()
box.intercept(1)
xpanel("")
xbutton("Fig 2", "xopen(\"fig2.hoc\")  box.unmap()")
xbutton("Fig 3B", "xopen(\"fig3.hoc\")  box.unmap()")
xpanel()
box.intercept(0)
box.map("Run Example")