Create a Button with Corona SDK

main.lua

--This adds the widget library to our project
local widget = require "widget"

--This is what is run when we press our button
local myButtonEvent = function (event )
    if event.phase == "release" then
        print( "You pressed and released the "..event.target.id.." button!" )
    end
end

--This will create a button using images
local myButton=widget.newButton{
        --The id can be used to tell you what button was pressed in your button event
	id = "mainMenuButton",
	--this is the default button image
	default="button_main_up.png",
	--this is the image to use when the button is pressed
	over="button_main_down.png",
	--this tells it what function to call when you press the button
        onEvent = myButtonEvent
}

--This will create a button using text
local myButton=widget.newButton{
        --The id can be used to tell you what button was pressed in your button event
	id = "myTextButton",
        --This is the text label to put on the button
	label = "My Button",
        --This is the start x coordinate of the Top Left Corner
	left=150,
        --This is the start y coordinate of the Top Left Corner
	top=150,
        --Emboss can be true or false, tells it to make the label look embossed/inset
	emboss=true,
        --The border around the outside of the button
	strokeWidth=4,
        --How round to make the corners
	cornerRadius=8,
	--this tells it what function to call when you press the button
        onEvent = myButtonEvent
}