WinRT gives you a lot of AppBar buttons out-of-the-box. These buttons can be found in the StandardStyles.xaml(don’t forget to comment them out if you want to use them) and are styled like this:
I wanted to create my own button and I was wondering where the value of the Content property() is coming from…
To find the related icon you’ll have to open the Character Map program & select the Segoe UI Symbol from the font list.
If you click on a specific character you see the value that is used inside the Content property(without the &#x at the beginning).