EventToCommand no DataTemplate

Estou usando a classe EventToCommand do MVVM-light-Toolkit para manipular o AutoGeneratingColumn-Event no WPF-DataGrid. Funciona bem no meu Main-DataGrid, mas eu uso outro DataGrid no RowDetailsTemplate e aqui tenho um problema: O AutoGeneratingColumn é acionado antes que o EventToCommand-Object seja gerado. Existe uma solução para este problema? Aqui está um pedaço do meu código Xaml:

<DataGrid DockPanel.Dock="Top" AutoGenerateColumns="True" Name="table" VerticalAlignment="Top" ItemsSource="{Binding PartBatchList}" IsReadOnly="True">
    <i:Interaction.Triggers>
            <i:EventTrigger EventName="AutoGeneratingColumn">
                <hgc:EventToCommand Command="{Binding AutoGeneratingColumnCommand}" PassEventArgsToCommand="True"/>
            </i:EventTrigger>
        </i:Interaction.Triggers>
    <DataGrid.RowDetailsTemplate>
        <DataTemplate>
            <StackPanel Margin="30,0,30,30" Orientation="Vertical">
                <Border CornerRadius="4" Padding="5" Background="White">
                    <DataGrid ItemsSource="{Binding Workpieces}"  
                                    CanUserReorderColumns="False" CanUserResizeColumns="False" CanUserSortColumns="False"
                                    AutoGenerateColumns="True" AutoGeneratingColumn="WorkpieceListAutoGeneratingColumn">
                        <i:Interaction.Triggers>
                            <i:EventTrigger EventName="AutoGeneratingColumn">
                                <hgc:EventToCommand Command="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGrid},AncestorLevel=2}, Path=DataContext.AutoGeneratingColumnCommand}" PassEventArgsToCommand="True"/>
                            </i:EventTrigger>
                        </i:Interaction.Triggers>
                    </DataGrid>
                </Border>
            </StackPanel>
        </DataTemplate>
    </DataGrid.RowDetailsTemplate>

</DataGrid>

O WorkpieceListAutoGeneratingColumn do manipulador de eventos no arquivo Code-Behind é chamado, o comando no meu ViewModel nunca é chamado.

Andreas

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