Pin down a grouping section while listview is scrolling?

In Xamarin forms I can't figure out how to pin down the "header" of a grouping so that it does not scroll with the items when a listview scrolls until the entire group is off the screen.

What I mean by that is like [(this video), notice how the section is pinned until all of the groups items are off the screen, and then scrolls off afterwards when the next section is ready to be pinned.

I've seen Androids and iOS apps behave this way all the time, I figured it was the native way grouping was handled. Is there a way to do this I missed? or is this a case of custom renderers?