How can we drag a button in xamarin.forms using custom renderers?

Hi,

I have to drag an element in the page using custom renderer. I am currently referring the following link from XLabs.

https://github.com/XLabs/Xamarin-Forms-Labs/blob/b7839b2cd47188fa61df452ab02174a54a35f309/Samples/XLabs.Sample/Pages/Controls/DragPage.xaml.cs

I have tried running the above code. It works fine. But when I try to implement this in my solution I get a blank page.

So, is there any alternate solution to do drag and drop in Xamarin.forms using custom renderers.