title: How to make GridView wrap its contents in XAML?
body: <p>As the title of the post, I want to make a GridView which can wrap all of it's contents inside, it means if I have 3 items, each of them has 50px of height, so how to make a GridView contains these item that has 50*3=150px of height.
  How to do that, please help me!</p>
  
  <p>P/s: I want to do it by configuring XAML code, not in C# code, thanks!</p>