Derived DataGrid does not display

[cornerbowlsoftware]

I am porting a WPF application and have overridden the DataGrid with many functions for focus, grouping and displaying row details. If I create a simple hello world derived class, so a class with nothing overridden, the DataGrid does not display. There are two DataGrids, the control and my derived. The control displays but the dervied does not. This works as expected for other controls, such as TextBox. Here's my sample axaml:

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:vm="clr-namespace:MyDataGrid.ViewModels"
             xmlns:local="using:MyDataGrid.Views"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="MyDataGrid.Views.MainView"
             x:DataType="vm:MainViewModel">
  <Design.DataContext>
    <vm:MainViewModel />
  </Design.DataContext>

	<Grid RowDefinitions="Auto,Auto">
		
		<DataGrid
			Grid.Row="0"
			Margin="8"
			BorderThickness="1"
			BorderBrush="Black"
			Height="200"
			Width="800"
			HeadersVisibility="All">
			<DataGrid.Columns>
				<DataGridTextColumn  Header="Name" Width="200"/>
				<DataGridTextColumn  Header="Email" Width="*"/>
			</DataGrid.Columns>
		</DataGrid>

		<local:BaseDataGrid
			Grid.Row="0"
			Margin="8"
			BorderThickness="1"
			BorderBrush="Black"
			Height="200"
			Width="800"
			HeadersVisibility="All">
			<DataGrid.Columns>
				<DataGridTextColumn  Header="Name" Width="200"/>
				<DataGridTextColumn  Header="Email" Width="*"/>
			</DataGrid.Columns>
		</local:BaseDataGrid>
	</Grid>
	
</UserControl>

Here's my derived class:

using Avalonia.Controls;

namespace MyDataGrid.Views
{
    public class BaseDataGrid : DataGrid
    {
    }
}

[stevemonaco]

You need to use StyleKeyOverride so that your derived control will have the visual appearance of a DataGrid. ie. use the DataGrid ControlTheme. See the docs: https://docs.avaloniaui.net/docs/basics/user-interface/styling/styles#style-key