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 <Window.Resources>
        <local:InfobuchDataSet x:Key="infobuchDataSet"/>
        <CollectionViewSource x:Key="cPInfosViewSource" Source="{Binding CPInfos, Source={StaticResource infobuchDataSet}}"/>
    </Window.Resources>
    <Grid DataContext="{StaticResource cPInfosViewSource}">
        <DataGrid x:Name="cPInfosDataGrid" AutoGenerateColumns="False" EnableRowVirtualization="True" ItemsSource="{Binding }" Margin="10,433,10,10" RowDetailsVisibilityMode="VisibleWhenSelected" SelectionChanged="cPInfosDataGrid_SelectionChanged">            
            <DataGrid.Columns>
                <DataGridTextColumn x:Name="iD_CPInfoColumn" Binding="{Binding ID_CPInfo}" Header="ID CPInfo" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="element_CPColumn" Binding="{Binding Element_CP}" Header="Element CP" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="elementstandort_CPColumn" Binding="{Binding Elementstandort_CP}" Header="Elementstandort CP" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="cMC_CPColumn" Binding="{Binding CMC_CP}" Header="CMC CP" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="melder_CPColumn" Binding="{Binding Melder_CP}" Header="Melder CP" Width="SizeToHeader"/>
                <DataGridTemplateColumn x:Name="eingetragen_amCPColumn" Header="Eingetragen am CP" Width="SizeToHeader">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <DatePicker SelectedDate="{Binding Eingetragen_amCP, Mode=TwoWay, NotifyOnValidationError=true, ValidatesOnExceptions=true}"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTextColumn x:Name="info1_CPColumn" Binding="{Binding Info1_CP}" Header="Info 1 CP" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="info2_CPColumn" Binding="{Binding Info2_CP}" Header="Info 2 CP" Width="SizeToHeader"/>
                <DataGridCheckBoxColumn x:Name="erledigt_CPColumn" Binding="{Binding Erledigt_CP, Mode=TwoWay}"  Header="Erledigt CP" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="erledigt_amCPColumn" Binding="{Binding Erledigt_amCP}" Header="Erledigt am CP" Width="SizeToHeader"/>
                <DataGridTextColumn x:Name="erledigt_durchCPColumn" Binding="{Binding Erledigt_durchCP}" Header="Erledigt durch CP" Width="SizeToHeader"/>

                <!--Binding="{Binding Erledigt_CP }" -->
            </DataGrid.Columns>