Corona SDK - Creating Stepper Widgets. Incremento y decremento

gistfile1.lua

local widget = require("widget")

local currentNumber = 0

-- Handle stepper events
local function onStepperPress(event)

	if( "increment" == event.phase ) then
		currentNumber = currentNumber + 1
	elseif ( "decrement" == event.phase ) then
		currentNumber = currentNumber -1
	end

	print( currentNumber )
end

--Create the widget
local newStepper = widget.newStepper
{
	left = 110,
	top = 300,
	minimumValue = 0,
	maximumValue = 50,
	onPress = onStepperPress
}