    /// button to bring up the history screen
    private let historyButton  = JGTapButton(frame: CGRect(x: 0,y: 0,width: 60,height: 60))
    
    func setupActions(target: AnyObject?, settings: Selector,  snap: Selector, locate: Selector, history: Selector) {
        self.axis = UILayoutConstraintAxis.Horizontal