Xamarin.Forms Animation and Skype For IOS

Hi there , one of the Xamarin Problems is the lack of the open source / third party library , for example if i want write my app with Objective-c I would find thousand of open source or paid library on any subject like Animation for example

if you haven't use Skype for IOS then Please open the following link with Google chrome as for some reason gif images doesn't work with firefox at least for me
http://blog.brianlovin.com/design-details-skype-for-ios/

What I'm interested in is >>>> 7 Swiping through the navigation

Any Idea how to implement that with Xamarin.Forms ? any code sample will be great

thanks