UserControl1.xaml

<UserControl
    x:Class="MemoryLeakTest.UserControl1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:MemoryLeakTest"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:controls="using:CommunityToolkit.WinUI.UI.Controls"
    mc:Ignorable="d">

    <Grid Background="#404040" Width="400" Height="400">
        <controls:DataGrid ItemsSource="{x:Bind _someData, Mode=OneWay}"
                           SelectionChanged="ItemListDataGrid_OnSelectionChanged"
                           IsTabStop="False" 
                           HorizontalAlignment="Center" 
                           AutoGenerateColumns="False" 
                           >
            <controls:DataGrid.Columns>
                <controls:DataGridTemplateColumn Header="Test" Width="75" Tag="checked">
                    <controls:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate x:DataType="local:SomeItem">
                            <Grid Width="20" IsTabStop="False">
                                <CheckBox VerticalAlignment="Center" IsTabStop="False" HorizontalAlignment="Left" IsChecked="{x:Bind Value3, Mode=TwoWay}"/>
                            </Grid>
                        </DataTemplate>
                    </controls:DataGridTemplateColumn.CellTemplate>
                </controls:DataGridTemplateColumn>
                <controls:DataGridTemplateColumn Header="Test" Width="*" Tag="name">
                    <controls:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate x:DataType="local:SomeItem">
                            <TextBlock VerticalAlignment="Center" Margin="10,0,0,0" Text="{x:Bind Value2}"/>
                        </DataTemplate>
                    </controls:DataGridTemplateColumn.CellTemplate>
                </controls:DataGridTemplateColumn>
                <controls:DataGridTemplateColumn Header="Test" Tag="value">
                    <controls:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate x:DataType="local:SomeItem">
                            <TextBlock VerticalAlignment="Center" Margin="10,0,10,0" Text="{x:Bind Value2}"/>
                        </DataTemplate>
                    </controls:DataGridTemplateColumn.CellTemplate>
                </controls:DataGridTemplateColumn>
            </controls:DataGrid.Columns>
        </controls:DataGrid>
    </Grid>
</UserControl>