<Window x:Class="CSWPFCascadeDataGridComboBoxColumns.MainWindow"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:local="clr-namespace:CSWPFCascadeDataGridComboBoxColumns"

    xmlns:toolkit ="http://schemas.microsoft.com/wpf/2008/toolkit"

    Title="Cascade DataGridComboBoxColumns" Height="300" Width="300" Loaded="Window_Loaded">

    <DockPanel LastChildFill="True">

        <toolkit:DataGrid Name="dataGrid" ItemsSource="{Binding}" 

                          AutoGenerateColumns="False" 

                          PreparingCellForEdit="datagrid_PreparingCellForEdit">

            <toolkit:DataGrid.Columns>

                <toolkit:DataGridComboBoxColumn x:Name="column1" Width="80"/>

                <toolkit:DataGridComboBoxColumn x:Name="column2" Width="80"/>               

            </toolkit:DataGrid.Columns>

        </toolkit:DataGrid>

    </DockPanel>

 

</Window>