SetSiblingIndex() is not a good choice in uGUI. Look to my variant: https://github.com/chromealex/Unity3D.UI.Windows.Core/blob/master/UI.Windows/Components/Default/Advanced/Carousel/CarouselComponent.cs
SetSiblingIndex() is not a good choice in uGUI. Look to my variant:
https://github.com/chromealex/Unity3D.UI.Windows.Core/blob/master/UI.Windows/Components/Default/Advanced/Carousel/CarouselComponent.cs