cocos2d with wax, overload method does not work?

[stone]

I'm using cocos2d with wax, I define A class as blew,

but the method "onEnter" had not being call at the time scene show.

what's should I define this class?

waxClass{"EnterScene", CCScene}

function EnterScene:scene()

    self = CCScene:node()

    local background = CCSprite:spriteWithFile("bck.png")

background:setPosition(CGPoint(320/2, 480/2))

self:addChild(background)

    return self

end

 

function EnterScene:onEnter()

    puts('===donot run this code?==')

end