Is it possible to include a block of XAML in another block of XAML?

Question

I have XAML that looks like this:

Answer 1

Create a directory called Templates, and then create a new View class, MyCustomGrid like so:

Templates/MyCustomGrid.xaml:

Templates/MyCustomGrid.xaml.cs

using Xamarin.Forms;

namespace MyProject.Templates
{
    public partial class MyCustomGrid : Grid
    {
        public MyCustomGrid()
        {
            InitializeComponent();
        }
    }
}

To use it in another page, ie MyPage.xaml: