GuiTrial

local component = require("component")
local gpu = component.gpu
local gui = require("gui")

local prgName = "Rob's Trial Gui"

function exitButtonCallback(guiID, id)
  local result = gui.getYesNo("", "Do you really want to exit? Ahh well get out", "")
  if result == true then
    os.exit()
  end
  gui.displayGui(myGui)
end

myGui = gui.newGui(2, 2, 78, 23, true)
exitbutton = gui.newButton(myGui, "center", 21, "exit", exitButtonCallback)

frame = gui.newFrame(myGui, 2, 5, 40, 6, "A frame")

hline = gui.newHLine(myGui, 5, 20, 40)

gui.clearScreen()
gui.setTop(prgName)

while true do
  gui.runGui(myGui)
end