MainWindow.xaml

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        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:local="clr-namespace:ChildNodesPath"
        xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid" 
        x:Class="ChildNodesPath.MainWindow"
        mc:Ignorable="d"
        Title="ChildNodesPathDemo" Height="350" Width="525">
    <Window.DataContext>
        <local:ViewModel/>
    </Window.DataContext>
    <Grid>
        <dxg:TreeListControl ItemsSource="{Binding DataItems}">
            <dxg:TreeListControl.Columns>
                <dxg:TreeListColumn FieldName="Name"/>
                <dxg:TreeListColumn FieldName="Executor"/>
                <dxg:TreeListColumn FieldName="State"/>
            </dxg:TreeListControl.Columns>
            <dxg:TreeListControl.View>
                <dxg:TreeListView  TreeDerivationMode="ChildNodesSelector" ChildNodesPath="Tasks"/>
            </dxg:TreeListControl.View>
        </dxg:TreeListControl>
    </Grid>
</Window>