Create Round Button with Border IN UWP Windows 10 C#

Question

I am trying to create a round button, with a White Border and a Transparent Background (as the old AppBarButtons in Windows 8.1) in UWP Windows 10.

I have found several

Answer 1

With version 1809 and later (even if you're targeting an earlier version like me below) you can just do this for an example of a round button:

and voila!

Make sure to add this at the top of your XAML with the other xmlns stuff.

xmlns:Windows10version1809="http://schemas.microsoft.com/winfx/2006/xaml/presentation?IsApiContractPresent(Windows.Foundation.UniversalApiContract, 7)"