title: Animate gridview items in sequence when added
body: <p>I would really like to have the <code>&lt;AddDeleteThemeTransition/&gt;</code> animate each element of my gridview in sequence. I'm using a custom class derived from GridView, which prevents me from simply using Task.Delay() when I'm loading the elements in my C#, because my gridview adapts the GridViewItem size according to the amount of elements. How  can  I achieve this?</p>