         buttonBack.imageView!.contentMode = UIViewContentMode.center
         buttonBack.imageView!.clipsToBounds = true
         buttonBack.imageView!.tintColor = UIColor(white:1, alpha:0.2)
+        buttonBack.addTarget(
+            self,
+            action:#selector(self.actionBack(sender:)),
+            for:UIControlEvents.touchUpInside)
         
         background.addSubview(buttonBack)
         addSubview(background)

        
        let layoutButtonBackTop:NSLayoutConstraint = NSLayoutConstraint.topToTop(
            view:buttonBack,
            toView:self)
        let layoutButtonBackBottom:NSLayoutConstraint = NSLayoutConstraint.bottomToBottom(
            view:buttonBack,
            toView:self)
        let layoutButtonBackLeft:NSLayoutConstraint = NSLayoutConstraint.leftToLeft(
            view:buttonBack,
            toView:self)
        let layoutButtonBackRight:NSLayoutConstraint = NSLayoutConstraint.rightToRight(
            view:buttonBack,
            toView:self)
        
        addConstraints([
            layoutBackgroundHeight,

            layoutButtonBackTop,
            layoutButtonBackBottom,
            layoutButtonBackLeft,
            layoutButtonBackWidth])
    }
    
    //MARK: actions
    
    func actionBack(sender button:UIButton)
    {
        
    }
}
