public HelloNSNotificationSender()
{
//create a button to trigger event
Vector2 size = CCDirector.sharedDirector.winSize;
CCMenuItemFont.FontSize = 28;
CCMenuItem button1 = new CCMenuItemFont("Cocos2d", onButtonTouched);
button1.userTag = "Cocos2d";
CCMenuItem button2 = new CCMenuItemFont("Unity", onButtonTouched);
button2.userTag = "Unity";
CCMenu menu = new CCMenu(button1, button2);
menu.alignItemsHorizontallyWithPadding(20);
menu.position = new Vector2(size.x/2, size.y/2 - 50);
addChild(menu);
}