MainWindow.xaml

<Window x:Class="DXTreeListSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid"
        xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
        xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
        dx:ThemeManager.ThemeName="DeepBlue"
		xmlns:local="clr-namespace:DXTreeListSample"
        Title="MainWindow" Height="350" Width="525"
        Name="win">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <dxg:TreeListControl x:Name="grid" >
            <dxg:TreeListControl.Columns>
                <dxg:TreeListColumn FieldName="Id"/>
                <dxg:TreeListColumn FieldName="ParentId"/>
				<dxg:TreeListColumn FieldName="Name"/>
            </dxg:TreeListControl.Columns>
            <dxg:TreeListControl.View>
                <local:MyTreeListView
                    x:Name="view" 
                    KeyFieldName="Id"
                    ParentFieldName="ParentId"
                    AutoWidth="True"
					ShowTotalSummary="True"
                    UseLightweightTemplates="None"/>
            </dxg:TreeListControl.View>
			<dxg:TreeListControl.TotalSummary>
				<dxg:TreeListSummaryItem FieldName="Id" SummaryType="Sum"/>
				<dxg:TreeListSummaryItem FieldName="Id" SummaryType="Count"/>
				<dxg:TreeListSummaryItem FieldName="Id" SummaryType="Min"/>
				<dxg:TreeListSummaryItem FieldName="Id" SummaryType="Max"/>
				<dxg:TreeListSummaryItem FieldName="Name" SummaryType="Count"/>
			</dxg:TreeListControl.TotalSummary>
        </dxg:TreeListControl>
    </Grid>
</Window>