     internal let direction: Direction
     internal let reverseHorizontalCoordinates: Bool
     internal let style: PopoverStyle
-    
+    internal let initialIndex: Int
+
     public var coverColor: UIColor? {
         didSet {
             self.items.forEach { (item: PopoverItem) -> () in

        }
    }
    
    public var initialIndex: Int = 0
    
    public init(
        items: [PopoverItem],
        fromView: UIView,
        direction: Direction = .down,
        reverseHorizontalCoordinates: Bool = false,
        style: PopoverStyle = .normal)
    {
        self.items = items
        self.fromView = fromView
        self.direction = direction
        self.reverseHorizontalCoordinates = reverseHorizontalCoordinates
        self.style = style
    }
    
    public init(
        items: [PopoverItem],
        fromView: UIView,

        style: PopoverStyle = .normal,
        initialIndex: Int = 0)
    {
        if 0 > initialIndex || initialIndex >= items.count {
            fatalError("initialIndex(\(initialIndex)) out of boundary.")
        }
        self.items = items
        self.fromView = fromView
        self.direction = direction
        self.reverseHorizontalCoordinates = reverseHorizontalCoordinates
        self.style = style
        self.initialIndex = initialIndex
    }
    
#if DEBUG
