         changeThumbFrameForPoint(label.center, animated: animated)
     }
     
-    func changeTitle(_ title: String, atIndex: Int) {
+    open func changeTitle(_ title: String, atIndex: Int) {
         if !isConfigurated {
             return
         }

        return attributedDefaultTitles[index].string
    }
    
    func attributedTitleAtIndex(_ index: Int) -> (normal: NSAttributedString, selected: NSAttributedString) {
        return (normal: attributedDefaultTitles[index], selected: attributedSelectedTitles[index])
    }
    
    func changeThumbShadowColor(_ color: UIColor) {
        if !isConfigurated {
            return
        }

        shadowLayer.shadowColor = color.cgColor
    }
    
    open func changeThumbColor(_ color: UIColor) {
        if !isConfigurated {
            return
        }
